Unbridled elation in digital projection (7)
I believe the answer is:
toenail
'digital projection' is the definition.
(protection on a digit of the foot)
'unbridled elation' is the wordplay.
'unbridled' indicates anagramming the letters (letters are unrestrained or unbridled).
'elation' with letters rearranged gives 'TOENAIL'.
'in' is the link.
(Other definitions for toenail that I've seen before include "Part of body perhaps painted" , "woman in labour" , "part of leg" , "Digital cover-- 21 across (anag)" , "Hard plate on part of foot" .)