Swallow mushroom, in turn (6)

I believe the answer is:

'swallow' is the definition.
(thesaurus)

'mushroom in turn' is the wordplay.
'mushroom' becomes 'cep' (Boletus edulis - an edible mushroom).
'in' indicates putting letters inside.
'turn' becomes 'act' (theatre).
'cep' going inside 'act' is 'ACCEPT'.

(Other definitions for accept that I've seen before include "Acknowledge" , "Reply in the affirmative" , "Consider or hold as true" , "Take on (responsibility)" , "Put up with" .)

I've seen this clue in The Telegraph.

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