Loved sum about mineral (6)
I believe the answer is:
adored
'loved' is the definition.
(adoring is a kind of loving)
'sum about mineral' is the wordplay.
'sum' becomes 'add' (synonyms).
'about' means one lot of letters goes inside another.
'mineral' becomes 'ore' (ore is a kind of mineral).
'add' placed around 'ore' is 'ADORED'.
(Other definitions for adored that I've seen before include "Worshipped, loved" , "Worshipped and revered" , "Deeply respected" , "Worshipped and venerated" , "Really liked" .)