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