On reflection, can picture monarch finding fault (10)
I believe the answer is:
nitpicking
'on reflection can picture monarch finding fault' is the definition.
I can't judge whether this definition defines the answer.
'on reflection can picture monarch' is the wordplay.
'on reflection' shows that the letters should be reversed in order.
'can' becomes 'tin' (both are metal containers).
'picture' becomes 'pic' (short for picture).
'monarch' becomes 'king' (male monarch).
'tin' in reverse letter order is 'nit'.
'nit'+'pic'+'king'='NITPICKING'
Can you help me to learn more?
(Another definition for nitpicking that I've seen is " Splitting hairs".)