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I already tried to google this but can't find an answer, first I thought it
was a question clause (not sure if correct term) but then I realized there's
no question word in that clause.

The sentence is from anime "kami nomi":

> 掃除ってレベルな **のか** これ 新品みたいにピカピカだぞ

I suppose the な before the なの follows the rule about distinguishing between
the possession particle の because レベル is a noun. Thank you beforehand.
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2018-08-31T14:47:41.890
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2018-08-31T18:57:49.867
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question
grammar
Whats does のか do in the next sentence
な → 連体形 (:"attributive form") of the verbal auxiliary だ

の → particle of nominalization

か → particle of "uncertainty" (question)

You cannot nominalize a word that is already a noun (レベル) so you have to add a
用言 (verb or adjective), or the 連体形 of だ which is な between the nominalizer and
the phrase.
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2018-08-31T15:18:13.890
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answer
Both の and か are question markers. の is also known as [explanatory-
no](https://japanese.stackexchange.com/q/5398/5010). If you combine both, のか
forms a "literary style" question suitable for monologues, news headlines,
book titles, blunt comments, etc. Please see [this
article](https://www.wasabi-jpn.com/japanese-grammar/question-markers/). By
"question word", do you mean interrogatives like どこ/だれ? An open question (or
WH-question in English) requires an interrogative, but a close question (or
yes/no question) does not require one.

> (Headline) ロボットは人間の仕事を奪うのか？  
>  Will Robots Take Your Job?

So a super-literal translation would be something like "Is it that this is the
level called cleaning?", but it means "Is this (really) something called
cleaning?"
CC BY-SA 4.0
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answer