Angry look from Elgar? (5)
I believe the answer is:
glare
'angry look' is the definition.
(I've seen this in another clue)
'from elgar?' is the wordplay.
'from' indicates an anagram (the anagram comes from the same letters).
'elgar' is an anagram of 'GLARE'.
(Other definitions for glare that I've seen before include "Too-bright light" , "Large (anag.)" , "fierce look" , "Stare fiercely - 5 down (anag)" , "Shine intensely" .)