Outfit with energy grabbing silver in equestrian discipline (8)
I believe the answer is:
dressage
'equestrian discipline' is the definition.
(I've seen this before)
'outfit with energy grabbing silver' is the wordplay.
'outfit' becomes 'dress' (I've seen this in other clues**).
'with' is a charade indicator (letters next to each other).
'energy' becomes 'e' (physics symbol as in E=mcr).
'grabbing' is an insertion indicator.
'silver' becomes 'ag' (Ag is the chemical symbol for silver).
'dress'+'e'='dresse'
'dresse' placed around 'ag' is 'DRESSAGE'.
'in' is the link.
(Other definitions for dressage that I've seen before include "Equestrian sport of manoeuvring" , "Olympic event" , "Equestrian manoeuvres" , "Art of horse training" , "Method of training horses to do manoeuvres" .)