Pigment made from mineral aggregate surrounding church (5)
I believe the answer is:
ochre
'pigment' is the definition.
(ochre is a colour)
'mineral aggregate surrounding church' is the wordplay.
'mineral aggregate' becomes 'ore' (I've seen this before).
'surrounding' indicates putting letters inside.
'church' becomes 'ch' (common abbreviation).
'ore' placed around 'ch' is 'OCHRE'.
'made from' acts as a link.
(Other definitions for ochre that I've seen before include "A shade" , "Money" , "Yellowish-orange colour" , "What gives a yellow colour" , "Orangey colour" .)