Good guides, who can be very talkative (7)

I believe the answer is:

gushers

'who can be very talkative' is the definition.
(gush can mean to talk a lot)

'good guides' is the wordplay.
'good' becomes 'g' (abbreviation).
'guides' becomes 'ushers' ('usher' can be a synonym of 'guide').
'g'+'ushers'='GUSHERS'

(Another definition for gushers that I've seen is " Active oil wells".)

I've seen this clue in The Guardian.

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