Flash giving off light (9)

I believe the answer is:

twinkling

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'flash giving off light' is the definition.
'twinkling' can be an answer for 'flash' (thesaurus). I'm not certain of the 'giving off light' bit.

'flash giving off light' is the wordplay.
'flash' becomes 'twink' (I've seen this in another clue).
'giving off light' becomes 'ling' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'twink'+'ling'='TWINKLING'

Can you help me to learn more?

(Other definitions for twinkling that I've seen before include "Bat of an eye" , "Sparkling like a star" , "Instant" , "Sparkling - moment" , "How stars appear" .)

I've seen this clue in The Telegraph.

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