Time to use poorer soldier (7)
I believe the answer is:
trooper
'soldier' is the definition.
(trooper is a kind of soldier)
'time to use poorer' is the wordplay.
'time' becomes 't'.
'to use' indicates an anagram.
'poorer' anagrammed gives 'rooper'.
't'+'rooper'='TROOPER'
(Other definitions for trooper that I've seen before include "Private soldier" , "He swears" , "Cavalry soldier" , "ship" , "Proverbially swearing soldier" .)