Digital projection tempered elation (7)
I believe the answer is:
toenail
'digital projection' is the definition.
(protection on a digit of the foot)
'tempered elation' is the wordplay.
'tempered' indicates an anagram (temper can mean to adjust or modify).
'elation' is an anagram of 'TOENAIL'.
(Other definitions for toenail that I've seen before include "such as met with in chiropody" , "Elation (anag)" , "One's occasionally filed" , "Digital cover-- 21 across (anag)" , "Digital protection!" .)