Bad time to bring back group of soldiers (5)
I believe the answer is:
troop
'group of soldiers' is the definition.
(I've seen this before)
'bad time to bring back' is the wordplay.
'bad' becomes 'poor' ('poor' can be similar in meaning to 'bad'**).
'time' becomes 't'.
'to bring back' says the letters should be written backwards.
'poor'+'t'='poort'
'poort' backwards is 'TROOP'.
(Other definitions for troop that I've seen before include "Cavalry unit commanded by a captain" , "Flock, crowd" , "A company of people, soldiers or scouts" , "Parade" , "Porto (anag.)" .)