Crossword Genius

Cross when receiving money in increasingly commercialised event? (4)

Ross

I believe the answer is:

xmas

I'm a little stuck... Click here to teach me more about this clue!

'increasingly commercialised event?' is the definition.
I can't tell whether this definition defines the answer.

'cross when receiving money' is the wordplay.
'cross' becomes 'x'.
'when' becomes 'as'.
'receiving' is an insertion indicator.
'money' becomes 'm' (abbreviation in economics).
'x'+'as'='xas'
'xas' placed around 'm' is 'XMAS'.

'in' acts as a link.

Can you help me to learn more?

(Other definitions for xmas that I've seen before include "Christmas (informal)" , "present time" , "Short for Christmas" , "Yule, Noel" , "Yuletide" .)

I've seen this clue in The Independent.
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