Crossword Genius

Passes on kiss every so often (3)

Ross

I believe the answer is:

oks

'passes' is the definition.
(oking is a kind of passing)

'on kiss every so often' is the wordplay.
'every so often' means one should take alternating letters.
'on'+'kiss'='onkiss'
The alternate letters of 'onkiss' are 'OKS'.

(Another definition for oks that I've seen is " Passes".)

I've seen this clue in The Times.
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