Cheap wine son puts down (6)

I believe the answer is:

plonks

'puts down' is the definition.
(plonking is a kind of putting down)

'cheap wine son' is the wordplay.
'cheap wine' becomes 'plonk' (plonk can informally mean cheap wine).
'son' becomes 's' (genealogical abbreviation for son).
'plonk'+'s'='PLONKS'

I've seen this clue in The Sun.

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