Losing wickets, club side (4)
I believe the answer is:
edge
'side' is the definition.
(I know that edge is a type of side)
'losing wickets club' is the wordplay.
'losing' suggests deleting specific letters.
'wickets' becomes 'W' (cricket abbreviation).
'club' becomes 'wedge' (type of golf club).
'wedge' with 'w' taken out is 'EDGE'.
(Other definitions for edge that I've seen before include "incisiveness" , "Margin, outside limit" , "small advantage" , "Bite" , "Some bordering" .)