Pelt with mineral causing uproar (6)
I believe the answer is:
furore
'uproar' is the definition.
('furore' can be a synonym of 'uproar')
'pelt with mineral' is the wordplay.
'pelt' becomes 'fur' ('fur' can be a synonym of 'pelt').
'with' says to put letters next to each other.
'mineral' becomes 'ore' (ore is a kind of mineral).
'fur'+'ore'='FURORE'
'causing' is the link.
(Other definitions for furore that I've seen before include "Turmoil, uproar" , "An uproar, outbreak of fury" , "Uproar, hullabaloo" , "An uproar, of admiration or anger" , "Uproar, fuss and fury" .)