Remember to visit again (6)
I believe the answer is:
recall
I believe this clue is a double definition.
'remember' is the first definition.
('recall' can be a synonym of 'remember')
'visit again' is the second definition.
('call' can be a synonym for 'visit' so perhaps 'recall' is OK for 'visit again')
'to' is the link.
(Other definitions for recall that I've seen before include "Summon back - ability to remember" , "Evoke" , "cancel" , "Get back" , "Summon back, perhaps to mind" .)