Player at Lord’s knocking back the lager? (4)
I believe the answer is:
slip
'player at lord's knocking' is the definition.
I can't judge whether this definition defines the answer.
'back the lager?' is the wordplay.
'back' shows that the letters should be reversed in order.
'the lager?' becomes 'pils' (Pilsner beer).
'pils' written backwards gives 'SLIP'.
Can you help me to learn more?
(Other definitions for slip that I've seen before include "One on cricket field" , "Error; lose one's footing" , "Drop" , "He should take his chances" , "Minor error; garment" .)