Bad time back in platoon? (5)
I believe the answer is:
troop
'platoon?' is the definition.
(thesaurus)
'bad time back' is the wordplay.
'bad' becomes 'poor' ('poor' can be similar in meaning to 'bad'**).
'time' becomes 't'.
'back' shows that the letters should be reversed in order.
'poor'+'t'='poort'
'poort' backwards is 'TROOP'.
'in' acts as a link.
(Other definitions for troop that I've seen before include "Large group (of soldiers?)" , "musical group perhaps" , "Flock, crowd" , "Group of people or animals" , "Porto (anag.)" .)