Being free to set out, perhaps, walk (6)
I believe the answer is:
stride
'walk' is the definition.
(striding is a kind of walking)
'being free to set out' is the wordplay.
I cannot really understand how this works, but
'free' could be 'rid' (similar in meaning) and 'rid' is present in the answer.
an anagram of 'set' is 'ste' which is within the remaining letters.
No letters remain.
This may be the basis of clue (or it may be nonsense).
'perhaps' acts as a link.
Can you help me to learn more?
(Other definitions for stride that I've seen before include "Long pace" , "Long decisive step" , "Take long paces" , "Take long steps" , "Extended footstep" .)