Altered appearance (8)
I believe the answer is:
disguise
'altered appearance' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for disguise that I've seen before include "Camouflage, mask" , "Conceal identity, perhaps with make-up" , "Conceal (one's identity)" , "Conceal (a feeling)" , "Change of appearance for concealment" .)