Gives in fast, when surrounded by most of the others (7)
I believe the answer is:
relents
'gives in' is the definition.
(I've seen this in another clue)
'fast when surrounded by most of the others' is the wordplay.
'fast' becomes 'lent' (Lent is a period of fasting in Christianity).
'when surrounded by' indicates putting letters inside.
'most of' means to remove the last letter.
'the others' becomes 'rest' (I've seen this before).
'rest' with its final letter taken off is 'res'.
'lent' placed inside 'res' is 'RELENTS'.
(Other definitions for relents that I've seen before include "Shows mercy" , "is slackening" , "Abates, softens" , "Comes round" , "Becomes less severe and more lenient" .)