Dic & Usages: be enough of a/an + noun

• Show your babies how important they are ... that they are enough of a reason to not live in fear and tyranny.
• The cash and the prize lists in many cases are enough of a temptation to get in, but think more for example what is your ultimate music goal.
• ... but certainly even in the suburban and rural regions of Beijing and, of course, the smaller cities obvious foreigners are enough of a rarity for people to stop and stare.

.... http://corpus.byu.edu/glowbe/x.asp?r1=&w=1024&h=600

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△ to be enough of a/an + noun = to be sufficiently qualified as a...

• I'm not enough of an expert to answer this question.

... http://www.eslhq.com/forums/esl-forums/english-questions/enough-other-people-68066/

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• Looking at some of the related polls and comments on our site, it seems that there are a number of folks that feel this is a solid step in the right direction for Samsung. ... or they feel that Galaxy Alpha wasn't enough of a departure in the looks department. ... So what's different, and why now? While there have been premium options before, Samsung honestly probably didn't feel they were enough of a threat.   [source]

• The internet was just getting underway back then, e-books weren't really a thing yet, but still, they were enough of a thing that it felt like a conscious choice to put it on paper. So let's think about how to earn that paper. ... [source]

• I don't know why people originally wore ties. But I think we should stop schools from making girls wear them, they are enough of a burden on us men. [source]