Sent charge on time (4)
I believe the answer is:
rapt
'sent' is the definition.
(thesaurus)
'charge on time' is the wordplay.
'charge' becomes 'rap' (I have seen 'Criminal charge ' mean 'rap' so perhaps 'charge' could also mean 'rap'**).
'on' says to put letters next to each other.
'time' becomes 't'.
'rap'+'t'='RAPT'
(Other definitions for rapt that I've seen before include "Fascinated in part" , "Gripped" , "Fully intent, fascinated" , "Delighted" , "Enraptured, entranced" .)