What bowler aims at from square leg? (7)
I believe the answer is:
ninepin
'what bowler aims at' is the definition.
'square leg?' is the wordplay.
'square' becomes 'nine' (I've seen this before).
'leg?' becomes 'pin' (pin is a kind of leg).
'nine'+'pin'='NINEPIN'
'from' is the link.
(Other definitions for ninepin that I've seen before include "over one goes" , "game" , "Type of bowling" , "What bowler tries to hit" , "Skittle" .)