Resident in Acton dressed to receive grail? (8)
I believe the answer is:
occupant
'resident' is the definition.
(I know that resident can be written as occupant)
'acton dressed to receive grail?' is the wordplay.
'dressed' is an anagram indicator ('dress' can mean 'prepare').
'to receive' means one lot of letters goes inside another.
'grail?' becomes 'cup' (grail is a kind of cup).
'acton' is an anagram of 'ocant'.
'ocant' placed around 'cup' is 'OCCUPANT'.
'in' is the link.
(Other definitions for occupant that I've seen before include "Homeowner or tenant" , "One in residence" , "Insider" , "Inmate" , "Indweller" .)