Unforeseen drawbacks in eligible bachelors? (7)

I believe the answer is:

catches

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'unforeseen drawbacks' is the definition.
'catches' can be an answer for 'drawbacks' (I've seen this before). I'm not certain of the 'unforeseen' bit.

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for catches that I've seen before include "Snags; door-fastenings" , "Hidden drawbacks" , "Drawbacks, difficulties not readily evident" .)

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