Try to get volunteers up with lure (7)
I believe the answer is:
attempt
'try to' is the definition.
(thesaurus)
'volunteers up with lure' is the wordplay.
'volunteers' becomes 'TA' (abbreviation for Territorial Army).
'up' says the letters should be written in reverse (in down clue: letters go upwards).
'with' is a charade indicator (letters next to each other).
'lure' becomes 'tempt' (synonyms).
'ta' in reverse letter order is 'at'.
'at'+'tempt'='ATTEMPT'
'get' acts as a link.
(Other definitions for attempt that I've seen before include "Stab" , "Effort; go" , "Tackle" , "Try to climb (a peak)" , "Try, endeavour" .)