Remember about visit (6)
I believe the answer is:
recall
'remember' is the definition.
(to recall something is to remember it)
'about visit' is the wordplay.
'about' becomes 're' (regarding).
'visit' becomes 'call' (synonyms).
're'+'call'='RECALL'
(Other definitions for recall that I've seen before include "cancel" , "Don''t forget - come again" , "Summon back as to memory" , "Request the return of a defective product" , "Order to return" .)