Suffer mentally concealing agitation (7)

I believe the answer is:

ferment

'agitation' is the definition.
(I know that agitation can be written as ferment)

'suffer mentally concealing' is the wordplay.
'concealing' indicates a hidden word.
'FERMENT' can be found hidden inside 'suffer mentally'.

(Other definitions for ferment that I've seen before include "Boil" , "Social unrest, agitation" , "Seething commotion" , "Make alcohol from sugar, using yeast" , "Undergo chemical reaction such as when sugar turns to alcohol" .)

I've seen this clue in The Telegraph.

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