Not as many to anoint? Bishop's not required (4)
I believe the answer is:
less
'not as many' is the definition.
(less means not as many)
'anoint? bishop's not required' is the wordplay.
'anoint?' becomes 'bless' (anointing is a kind of blessing).
'bishop' becomes 'B' (chess abbreviation).
'not required' is a deletion indicator.
'bless' with 'b' taken away is 'LESS'.
'to' is the link.
(Other definitions for less that I've seen before include "Smaller in amout or degree" , "See 12" , "In smaller quantity" , "Comparative of 'a little'" , "Fewer; minus" .)