Being resigned to doing without a mushroom (9)

I believe the answer is:

accepting

I'm a little stuck... Click here to teach me more about this clue!

'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.

Can you help me to learn more?

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

I've seen this clue in The Independent.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.