Crossword Genius

Carp, as exploring geologists may do (9)

Ross

I believe the answer is:

findfault

I'm a little stuck... Click here to teach me more about this clue!

'exploring geologists may do' is the definition.
I know nothing about this answer so I can't judge whether this works.

'carp as' is the wordplay.
I cannot really understand how this works, but
'as' could be 'in' (I've seen this in other clues) and 'in' is present in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Irish News.
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