Crossword Genius

Knocking back lager is a slight mistake (4)

Ross

I believe the answer is:

slip

'a slight mistake' is the definition.
(I've seen this before)

'knocking back lager' is the wordplay.
'knocking back' is a reversal indicator.
'lager' becomes 'pils' (I've seen this before).
'pils' written backwards gives 'SLIP'.

'is' acts as a link.

(Other definitions for slip that I've seen before include "printer's proof" , "Cutting" , "Man in field" , "Drop" , "failure" .)

I've seen this clue in The Guardian.
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