Crossword Genius

Salesperson Pat returns: he knocks (6)

Ross

I believe the answer is:

tapper

'he knocks' is the definition.
(someone who taps or knocks)

'salesperson pat returns' is the wordplay.
'salesperson' becomes 'rep' (sales rep).
'returns' says the letters should be written backwards.
'rep'+'pat'='reppat'
'reppat' in reverse letter order is 'TAPPER'.

(Another definition for tapper that I've seen is " latex-collector".)

I've seen this clue in The Times.
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