Too quick a shot, very ungainly (9)
I believe the answer is:
overhasty
'too quick' is the definition.
(I've seen this before)
'a shot very ungainly' is the wordplay.
'ungainly' indicates anagramming the letters.
'a'+'shot'+'very'='ashotvery'
'ashotvery' anagrammed gives 'OVERHASTY'.
(Other definitions for overhasty that I've seen before include "Too quick" , "too impulsive" , "not looking before leaping" , "Rash; too fast" , "Too hurried" .)