Swear to reunite lovers to the end of time (7)
I believe the answer is:
resolve
'swear' is the definition.
The definition and answer can be both to do with communicating as well as being verbs in their base form.
Perhaps you can see a link between them that I can't see?
'reunite lovers to the end of time' is the wordplay.
'reunite' is an anagram indicator (I've seen 'reuniting' mean this (letters are put together again in a new way)).
'to the end of' suggests the final letters.
The last letter of 'time' is 'e'.
'lovers' with letters rearranged gives 'resolv'.
'resolv'+'e'='RESOLVE'
'to' is the link.
Can you help me to learn more?
(Other definitions for resolve that I've seen before include "Decide; firm determination" , "Settle (a matter)" , "Make a firm decision" , "Firmly decide" , "split up" .)