Try new offer and wait, ultimately (6)
I believe the answer is:
effort
'try' is the definition.
('effort' can be a synonym of 'try')
'new offer and wait ultimately' is the wordplay.
'new' indicates anagramming the letters.
'and' is a charade indicator (letters next to each other).
'ultimately' indicates one should take the final letters.
The final letter of 'wait' is 't'.
'offer' anagrammed gives 'effor'.
'effor'+'t'='EFFORT'
(Other definitions for effort that I've seen before include "The use of physical or mental energy" , "Attempt, endeavour" , "A bid or endeavour" , "Work - application" , "Vigorous attempt" .)