Track that POW might make? (7)
I believe the answer is:
towpath
'track' is the definition.
(I have seen 'Canalside track ' mean 'towpath' so perhaps 'track' could also mean 'towpath')
'that pow might make?' is the wordplay.
'might make?' indicates anagramming the letters (the letters might make if rearranged).
'that'+'pow'='thatpow'
'thatpow' with letters rearranged gives 'TOWPATH'.
(Other definitions for towpath that I've seen before include "Track beside a canal" , "Walkway beside canal" , "Canalside track" , "Track by waterway" , "Waterside track for horses" .)