Negotiated walk involving time and energy (7)
I believe the answer is:
'negotiated' is the definition.
(I've seen this in another clue)
'walk involving time and energy' is the wordplay.
'walk' becomes 'tread' (treading is a kind of walking).
'involving' is an insertion indicator.
'time' becomes 't' (abbreviation).
'and' is a charade indicator (letters next to each other).
'energy' becomes 'e' (physics symbol as in E=mcr).
'tread' placed around 'te' is 'TREATED'.
(Other definitions for treated that I've seen before include "given therapy" , "Handled" , "Provided remedies for" , "Given medical attention" , "Attended to" .)