Bar limited river passage (7)
I believe the answer is:
excerpt
'passage' is the definition.
(I know that excerpt is a type of passage)
I can't explain the rest of the clue.
(Other definitions for excerpt that I've seen before include "A passage or quotation from" , "Selected passage from larger work" , "Passage taken from book etc" , "Passage taken from a larger work" , "Extracted passage from book" .)