March — miserable time for uprising (5)
I believe the answer is:
troop
'march' is the definition.
(trooping is a kind of marching)
'miserable time for uprising' is the wordplay.
'miserable' becomes 'poor' ('poor' can be a synonym of 'miserable').
'time for' becomes 't' (I've seen this in other clues).
'uprising' shows that the letters should be reversed in order.
'poor'+'t'='poort'
'poort' in reverse letter order is 'TROOP'.
(Other definitions for troop that I've seen before include "Cavalry unit commanded by a captain" , "musical group perhaps" , "Large group (of soldiers?)" , "Porto (anag.)" , "Gang" .)