Think back about visit (6)
I believe the answer is:
recall
'think back' is the definition.
'about visit' is the wordplay.
'about' becomes 're' (regarding**).
'visit' becomes 'call' ('call' can be a synonym of 'visit').
're'+'call'='RECALL'
(Other definitions for recall that I've seen before include "Get back" , "cancel" , "order to come back" , "Request the return of a defective product" , "Hark back" .)