Gland unusually red Alan (7)
I believe the answer is:
adrenal
'gland' is the definition.
(adrenal is a kind of gland)
'unusually red alan' is the wordplay.
'unusually' indicates anagramming the letters.
'red'+'alan'='redalan'
'redalan' anagrammed gives 'ADRENAL'.
(Other definitions for adrenal that I've seen before include "close to the kidneys!" , "Gland that secretes the fight or flight hormone" , "Gland near the kidneys" , "Relating to glands near the kidneys" , "(Gland) on the kidney" .)