Mineral around church is a certain colour (5)
I believe the answer is:
ochre
'certain colour' is the definition.
'ochre' can be an answer for 'colour' (ochre is a kind of colour). I am not certain of the 'certain' bit.
'mineral around church' is the wordplay.
'mineral' becomes 'ore' (ore is a kind of mineral).
'around' indicates putting letters inside.
'church' becomes 'ch' (common abbreviation).
'ore' placed around 'ch' is 'OCHRE'.
'is a' is the link.
Can you help me to learn more?
(Other definitions for ochre that I've seen before include "Orange" , "Yellow-orange colour" , "Yellow-red mineral from iron oxide used as pigment" , "Earth-coloured pigment" , "Yellowish-orange colour" .)