Love you and I visiting new theatres (10)
I believe the answer is:
sweetheart
'love' is the definition.
(I've seen this before)
'you and i visiting new theatres' is the wordplay.
'you and i' becomes 'we'.
'visiting' is an insertion indicator.
'new' is an anagram indicator.
'theatres' anagrammed gives 'setheart'.
'we' going into 'setheart' is 'SWEETHEART'.
(Other definitions for sweetheart that I've seen before include "Beloved" , "flame?" , "baby" , "Love" , "boyfriend?" .)