Being resigned to doing without a mushroom (9)

I believe the answer is:

accepting

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'being resigned' is the definition.
(thesaurus)

'doing without a mushroom' is the wordplay.
'doing' becomes 'acting' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'without' indicates putting letters inside ('without' can be similar in meaning to 'outside').
'a mushroom' becomes 'cep' (name for Boletus edulis - an edible mushroom).
'acting' going around 'cep' is 'ACCEPTING'.

'to' acts as a link.

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(Another definition for accepting that I've seen is " Tolerant".)

I've seen this clue in the Independent.

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