Crossword Genius

Vapid chatter to flag up (3)

Ross

I believe the answer is:

gas

'vapid chatter' is the definition.
(gas can mean casual talk)

'flag up' is the wordplay.
'flag' becomes 'sag' (synonyms).
'up' is a reversal indicator (in down clue: letters go upwards).
'sag' in reverse letter order is 'GAS'.

'to' is the link.

(Other definitions for gas that I've seen before include "eg Helium" , "Americans' petrol" , "Fumes, vapour" , "Talk profusely" , "16 (US)" .)

I've seen this clue in The Times.
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