Crossword Genius

Pessimism, for example, during Christmas scene (10)

Ross

I believe the answer is:

negativity

'pessimism' is the definition.
(negativity is a kind of pessimism)

'example during christmas scene' is the wordplay.
'example' becomes 'eg' (short for 'exempli gratia', 'for example' in Latin).
'during' means one lot of letters goes inside another.
'christmas scene' becomes 'nativity' (I've seen this in another clue).
'eg' put within 'nativity' is 'NEGATIVITY'.

'for' is the link.

(Another definition for negativity that I've seen is " Expression of pessimism".)

I've seen this clue in The Times.
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