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>
> 女優志望なだけあって自分の見せ方わかってる感じがした。([source](https://twitter.com/mss_oknw/status/760863386489921537))

> 爆豪君ってヒーロー志望なだけあるよね
> ([source](https://www.pixiv.net/novel/show.php?id=16019300))

Given that 志望 is a noun, I don't know what な is doing here.

>
> 私も本日、二次面接通過の返事を頂けたものです！第一志望なだけに、ひとまずすごく嬉しいです！([source](https://career.keipro.net/japan/200604051749016993/))

I would've expected 第一志望だけに without な. I can't seem to find any
related/similar questions, and this issue seemingly hasn't been asked before
on this site. Nor was I successful in finding a page about this grammar point
on the web at large.
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question
syntax particle-な particle-だけ
名詞 + なだけ: 志望なだけある
The な is 連体形 of だ, and as you see, it can be omitted (or replaced by である).

  * 女優志望だけあって
  * 女優志望 **な** だけあって
  * （女優志望 **である** だけあって)

All of these mean the same. (Except であるだけあって is clumsy; it sounds less so in
the last example: 第一志望であるだけに)

--

To me, using な sounds (slightly) more natural, or simply easier when speaking.
It possibly has something to do with
[だけ](https://dictionary.goo.ne.jp/word/%E3%81%A0%E3%81%91/#jn-136029) being
originally a noun 丈.
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answer