Passage recce beginning in bar (7)
I believe the answer is:
excerpt
'passage' is the definition.
(I know that excerpt is a type of passage)
'recce beginning in bar' is the wordplay.
'recce beginning' becomes 'r' (I am not sure about this - if you are sure you should believe this answer much more).
'in' indicates putting letters inside.
'bar' becomes 'except' (both can mean 'not including').
'r' put into 'except' is 'EXCERPT'.
Can you help me to learn more?
(Other definitions for excerpt that I've seen before include "Piece of work" , "Piece from book etc" , "Quote" , "Sample of work" , "Piece (of music or book)" .)