Composer crossing street to see lexicographer (7)
I believe the answer is:
webster
'lexicographer' is the definition.
(Webster is an example)
'composer crossing street' is the wordplay.
'composer' becomes 'weber' (Carl Maria von Weber was a German composer).
'crossing' is an insertion indicator.
'street' becomes 'st'.
'weber' enclosing 'st' is 'WEBSTER'.
'to see' is the link.
(Other definitions for webster that I've seen before include "American lexicographer" , "dictionary?" , "US lexicographer" , "Dramatist" .)