The sheik, being active, walks (5)
I believe the answer is:
hikes
'walks' is the definition.
(hiking is a kind of walking)
'the sheik being active' is the wordplay.
'being active' indicates anagramming the letters (the letters are active/moving).
'sheik' with letters rearranged gives 'HIKES'.
(Other definitions for hikes that I've seen before include "Tramps" , "Long walks" , "Raises" .)