Crossword Genius

Destroy with moving victory at beginning of winter (8)

Ross

I believe the answer is:

decimate

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

'destroy' is the definition.
(I've seen this before)

'moving victory at beginning of winter' is the wordplay.
I cannot really understand how this works, but
'at' is present in the answer.
The remaining letters 'decime' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

'with' acts as a link.

Can you help me to learn more?

(Other definitions for decimate that I've seen before include "Reduce greatly (by 10%?) in number" , "Kill one in ten (as Romans did as punishment for mutiny)" , "Medicate (anag.)" , "severely cut" , "By killing" .)

I've seen this clue in The Times.
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