See an oaf hit (5)
I believe the answer is:
clout
'hit' is the definition.
(I've seen this before)
'see an oaf' is the wordplay.
'see' becomes 'C' (the word for the letter, according to Chambers).
'an oaf' becomes 'lout' (synonyms).
'c'+'lout'='CLOUT'
(Other definitions for clout that I've seen before include "Punch; influence" , "weight" , "strike" , "authority" , "Influence or power" .)