Dispatch second conclusion (4)
I believe the answer is:
send
'dispatch' is the definition.
(thesaurus)
'second conclusion' is the wordplay.
'second' becomes 's' (common abbreviation).
'conclusion' becomes 'end' (end is a kind of conclusion**).
's'+'end'='SEND'
(Other definitions for send that I've seen before include "Cause to go for" , "Consign" , "broadcast" , "Transmit (message)" , "Transport" .)