Come back to see the parson and I sit beside him (7)
I believe the answer is:
revisit
'come back' is the definition.
(revisiting is a kind of coming back)
'i sit beside him' is the wordplay.
'beside' means one lot of letters go next to another (I've seen this in other clues).
'him' becomes 'rev' (I am not sure about this - if you are sure you should believe this answer much more).
'i'+'sit'='isit'
'isit' after 'rev' is 'REVISIT'.
'to see the parson and' is the link.
This may not be correct. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for revisit that I've seen before include "Go back to (place)" , "Come back" , "coming to call back?" , "comeback?" , "Pay further call" .)