Charity resettled majority of grey seals (8)
I believe the answer is:
largesse
'charity' is the definition.
(I've seen this before)
'resettled majority of grey seals' is the wordplay.
'resettled' indicates anagramming the letters (letters must be resettled in a new order).
'majority of' means to remove the last letter.
'grey' with its last letter removed is 'gre'.
'gre'+'seals'='greseals'
'greseals' with letters rearranged gives 'LARGESSE'.
(Other definitions for largesse that I've seen before include "Liberal gift" , "Money or gifts generously given" , "Magnanimity, munificence" , "Generous disposal of gifts" , "Generosity in giving gifts" .)