Inactive person's walked around outside (7)
I believe the answer is:
dormant
'inactive' is the definition.
(I know that inactive can be written as dormant)
'person's walked around outside' is the wordplay.
'person' becomes 'man' (man is a kind of person).
'walked' becomes 'trod' (treading is a kind of walking).
'around' says the letters should be written in reverse.
'outside' indicates putting letters inside.
'trod' written backwards gives 'dort'.
'man' inserted within 'dort' is 'DORMANT'.
(Other definitions for dormant that I've seen before include "asleep" , "Latent" , "Inert" , "Temporarily inactive, being mordant" , "Sleeping or inactive, say volcano" .)