Rebel adroitly hides around valley (4)
I believe the answer is:
dale
'valley' is the definition.
(dale is a kind of valley)
'rebel adroitly hides around' is the wordplay.
'hides' says the answer is hidden in the clue.
'around' says the letters should be written in reverse.
'elad' can be found hidden inside 'rebel adroitly'.
'elad' reversed gives 'DALE'.
(Other definitions for dale that I've seen before include "Valley; Trollope's Bell and Lily" , "Valley, particularly in Northern England" , "Low ground" , "Up hill and down . . . ." , "An English valley" .)