One shot for being pale! (4)
I believe the answer is:
ashy
'being pale' is the definition.
(I've seen this before)
'one shot' is the wordplay.
'one' becomes 'a' (a thing is one thing).
'shot' becomes 'shy' (both can mean an act of throwing something).
'a'+'shy'='ASHY'
'for' is the link.
(Other definitions for ashy that I've seen before include "covered in dust" , "Dusty" , "Like burnt residue" , "evidence of recent fire" , "Pale grey" .)