Cricketer with beer to knock back (4)
I believe the answer is:
slip
'cricketer' is the definition.
(position in cricket)
'beer to knock back' is the wordplay.
'beer' becomes 'pils' (Pilsner beer).
'to knock back' is a reversal indicator.
'pils' in reverse letter order is 'SLIP'.
'with' acts as a link.
(Other definitions for slip that I've seen before include "Slight error" , "Mistake (of tongue or pen)" , "Drop" , "release > voucher" , "Man in field" .)