He'll find fault to repair on bridge (10)
I believe the answer is:
crosspatch
'he'll find fault' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'repair on bridge' is the wordplay.
'repair' becomes 'patch' (patching is a kind of repairing**).
'on' says to put letters next to each other.
'bridge' becomes 'cross' (I've seen this in other clues).
'patch' put after 'cross' is 'CROSSPATCH'.
'to' is the link.
Can you help me to learn more?
(Other definitions for crosspatch that I've seen before include "peevish person" , "Grump" , "Ill-natured person" , "Irascible type" , "Grumpy type" .)