Kiss parents when families get together (4)

I believe the answer is:

xmas

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'families get together' is the definition.
I can't tell whether this defines the answer.

'kiss parents' is the wordplay.
'kiss' becomes 'x' (X can represent a kiss).
'parents' becomes 'mas' (ma is a kind of parent).
'x'+'mas'='XMAS'

'when' acts as a link.

Can you help me to learn more?

(Other definitions for xmas that I've seen before include "Festive season (abbr)" , "December festival" , "Christmas (abbrev.)" , "Short celebration" , "Yuletide" .)

I've seen this clue in The Independent.

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