Hate to have dispatched it all over again (6)
I believe the answer is:
resent
'hate' is the definition.
(thesaurus)
'dispatched it all over again' is the wordplay.
I cannot really see how this works, but
'dispatched' could be 'sent' (I've seen this before) and 'sent' is found within the answer.
'it' could be 'e' ('e' can mean 'electronic' which is similar to 'IT') and 'e' is present in the answer.
A single letter 'r' remains which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).
'to have' is the link.
Can you help me to learn more?
(Other definitions for resent that I've seen before include "given another posting?" , "Feel bitter or indignant about" , "being put in post again" , "Feel affronted by" , "grudge" .)