Gas bubble the retort displays (7)

I believe the answer is:

blether

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

'bubble the retort displays' is the wordplay.
'displays' indicates the answer is hidden within the clue.
'BLETHER' can be found hidden inside 'bubble the retort'.

(Other definitions for blether that I've seen before include "Idle talk" , "gas" , "Yak" , "gossip" .)

I've seen this clue in The Times.

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