Possibly metering the soldiers (8)
I believe the answer is:
regiment
'the soldiers' is the definition.
'possibly metering' is the wordplay.
'possibly' indicates anagramming the letters.
'metering' is an anagram of 'REGIMENT'.
(Other definitions for regiment that I've seen before include "Section of an army" , "Brigade" , "a whole lot of them" , "Metering (anag) - army unit" , "Order" .)