Sort of motor — or band — I refitted (7)
I believe the answer is:
inboard
'sort of motor' is the definition.
(inboard motor)
'or band i refitted' is the wordplay.
'refitted' is an anagram indicator (I've seen 'refitting' mean this).
'or'+'band'+'i'='orbandi'
'orbandi' is an anagram of 'INBOARD'.
(Other definitions for inboard that I've seen before include "description of boat's engine" , "Seated inside executive jet" , "Within a ship or plane" , "Within the hull of a ship or boat" , "housed in Hull?" .)