Stroll or walk without leader (5)
I believe the answer is:
amble
'stroll' is the definition.
('amble' can be a synonym of 'stroll')
'walk without leader' is the wordplay.
'walk' becomes 'ramble' (ramble is a kind of walk).
'without leader' means to remove the first letter.
'ramble' with its initial letter removed is 'AMBLE'.
'or' acts as a link.
(Other definitions for amble that I've seen before include "Walk along slowly" , "Walk gently" , "Go at a leisurely gait" , "Walk at an easy pace" , "Casual walk" .)