After games start, kittens twinkle (7)

I believe the answer is:

glitter

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

'after games start kittens' is the wordplay.
'after games start' becomes 'g' (I can't justify this - if you can you should give a lot more credence to this answer).
'kittens' becomes 'litter' (I've seen this before).
'g'+'litter'='GLITTER'

Can you help me to learn more?

(Other definitions for glitter that I've seen before include "Are bright" , "Decorative sparkle" , "Sparkle on cards" , "Sparkly decoration" , "Flashiness" .)

I've seen this clue in The Daily Express.

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