Fixed in a flash (4)

I believe the answer is:

fast

I believe this is a double definition.

'fixed' is the first definition.
(synonyms)

'in a flash' is the second definition.
(thesaurus)

(Other definitions for fast that I've seen before include "Rapidly; tight" , "Period during which fare is reduced" , "Starve; quick" , "Go hungry" , "Quick - stop eating" .)

I've seen this clue in The Sun.

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