A large bloke in bay (6)
I believe the answer is:
alcove
'bay' is the definition.
('alcove' can be a synonym of 'bay')
'a large bloke' is the wordplay.
'large' becomes 'l'.
'bloke' becomes 'cove' (I've seen this in other clues).
'a'+'l'+'cove'='ALCOVE'
'in' acts as a link.
(Other definitions for alcove that I've seen before include "Niche - retreat" , "private part?" , "A small recess or niche" , "Recessed area" , "Small opening - a clove (anag)" .)