Angry about being long-limbed and slender (5)
I believe the answer is:
rangy
'long-limbed and slender' is the definition.
(I've seen this in another clue)
'angry about' is the wordplay.
'about' indicates an anagram.
'angry' anagrammed gives 'RANGY'.
'being' is the link.
(Other definitions for rangy that I've seen before include "with gangly limbs" , "Long-legged" , "with long legs" , "Tall and thin" , "Gangling" .)