The most common and most likely answer to this crossword clue is the 10 letter word CROSSPATCH
I've seen this crossword clue in Independent
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More clues leading to the result CROSSPATCH
- Peevish type giving mongrel a common dog’s name
- Sign of error with repair makes one irritable
- Ford repair makes one bad-tempered
- He’ll find fault to repair on bridge
- Pass out after injection into sensitive area, as one moaning
- See 5
- Go over plot for one who’s habitually bad-tempered
- Go over way to entertain constant moaner
- Song about Ross Poldark initially being a surly fellow
- Religious symbol on bed could make someone grumpy
Buddy explains!

The straight part
We know that "He’ll find fault" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case he’ll find fault = crosspatch.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does CROSSPATCH mean?
CROSSPATCH noun- A grumpy, bad-tempered or irascible person.