Undergarment for cricketer (4)
I believe the answer is:
slip
This clue is a double definition.
'undergarment' is the first definition.
(slip is a kind of undergarment)
'cricketer' is the second definition.
(position in cricket)
'for' acts as a link.
(Other definitions for slip that I've seen before include "Cutting" , "Cricket fielder - mistake" , "failure" , "Slide; fielder" , "Error; piece of paper" .)