Vagabond's foot less damp on the outside (7)
I believe the answer is:
drifter
'vagabond's' is the definition.
(I've seen this in another clue)
'foot less damp on the outside' is the wordplay.
'foot' becomes 'ft' (abbreviation).
'less damp' becomes 'drier' (I've seen this in another clue).
'on the outside' indicates putting letters inside.
'ft' inserted into 'drier' is 'DRIFTER'.
(Other definitions for drifter that I've seen before include "Fishing boat; hobo" , "Fishing boat; nomad" , "one unsettled" , "Ship - a tramp, possibly" , "Itinerant type" .)