Crossword Genius

Knock back lager and fall over (4)

Ross

I believe the answer is:

slip

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'fall over' is the definition.
'slip' can be an answer for 'fall' (I've seen this in another clue). I am unsure of the 'over' bit.

'knock back lager' is the wordplay.
'knock back' is a reversal indicator.
'lager' becomes 'pils' (Pilsner beer).
'pils' back-to-front is 'SLIP'.

'and' acts as a link.

Can you help me to learn more?

(Other definitions for slip that I've seen before include "Loose one's footing" , "release > voucher" , "Lingerie item - fielding position" , "Silly little mistake" , "printer's proof" .)

I've seen this clue in The Times.
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