Crossword Genius

Knock back lager? That's a mistake (4)

Ross

I believe the answer is:

slip

'that's a mistake' is the definition.
(a slip is a blunder or mistake)

'knock back lager?' is the wordplay.
'knock back' is a reversal indicator.
'lager?' becomes 'pils' (Pilsner beer).
'pils' reversed gives 'SLIP'.

(Other definitions for slip that I've seen before include "Strip" , "shift" , "Cricket fielder - mistake" , "Minor mistake - undergarment" , "pre-printed form" .)

I've seen this clue in The Everyman puzzle in The Observer.
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