Crossword Genius

The usual knock-up (3)

Ross

I believe the answer is:

par

'the usual' is the definition.
(I've seen this in another clue)

'knock-up' is the wordplay.
'knock' becomes 'rap' (synonyms).
'up' says the letters should be written in reverse (in down clue: letters go upwards).
'rap' in reverse letter order is 'PAR'.

(Other definitions for par that I've seen before include "Median" , "Usual score at golf" , "Average - equality" , "Accepted standard" , "Normal golfing score" .)

I've seen this clue in the Evening Standard.
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