Crossword Genius

Knocking back lager a mistake? (4)

Ross

I believe the answer is:

slip

'a mistake?' is the definition.
(slip is a kind of mistake)

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

(Other definitions for slip that I've seen before include "Fall on the thinned potter's clay" , "release > voucher" , "Silly little mistake" , "Error; lose one's footing" , "Minor mistake - undergarment" .)

I've seen this clue in The Times.
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