Marches in street to keep needy uplifted (6)
I believe the answer is:
troops
'marches' is the definition.
(trooping is a kind of marching)
'street to keep needy uplifted' is the wordplay.
'street' becomes 'st' (abbreviation).
'to keep' is an insertion indicator.
'needy' becomes 'poor' (similar in meaning).
'uplifted' shows that the letters should be reversed in order.
'st' placed around 'poor' is 'spoort'.
'spoort' in reverse letter order is 'TROOPS'.
'in' acts as a link.
(Other definitions for troops that I've seen before include "Groups of soldiers" , "Bodies of soldiers" , "Soldiers, armed forces" , "Military forces" , "Army" .)