Stroll accomplished covering miles (5)
I believe the answer is:
amble
'stroll' is the definition.
(synonyms)
'accomplished covering miles' is the wordplay.
'accomplished' becomes 'able' (I've seen this in other clues).
'covering' is an insertion indicator.
'miles' becomes 'm' (common abbreviation).
'able' placed around 'm' is 'AMBLE'.
(Other definitions for amble that I've seen before include "Walk in a leisurely fashion" , "Mosey (along)" , "Blame (anag.)" , "Swan" , "Blame for slow walk" .)