Remember about a visit (6)
I believe the answer is:
recall
'remember' is the definition.
(to recall something is to remember it)
'about a visit' is the wordplay.
'about' becomes 're' ('re' means regarding or about).
'a visit' becomes 'call' (call is a kind of visit).
're'+'call'='RECALL'
(Other definitions for recall that I've seen before include "Get back" , "Request the return of a defective product" , "Remember; demand back" , "cancel" , "Summon back as to memory" .)