Transport hit man uses with exuberance (10)
I believe the answer is:
enthusiasm
'exuberance' is the definition.
('enthusiasm' can be a synonym of 'exuberance')
'transport hit man uses' is the wordplay.
'transport' is an anagram indicator (each letter must be moved or 'transported').
'hit'+'man'+'uses'='hitmanuses'
'hitmanuses' with letters rearranged gives 'ENTHUSIASM'.
'with' acts as a link.
(Other definitions for enthusiasm that I've seen before include "Zeal" , "Avidity" , "spirit?" , "Intense and lively interest" , "Ardour" .)