Club choir, one lacking some parts (4)
I believe the answer is:
iron
'club' is the definition.
(type of golf club)
'choir one lacking some parts' is the wordplay.
'some parts' indicates the answer is hidden within the clue (I've seen 'some part of' mean this).
'IRON' is hidden within 'choir one lacking'.
(Other definitions for iron that I've seen before include "great strength" , "Ferrous metal" , "sort of club" , "Former dividing line across Europe" , "The one who was 'not for turning'" .)