Section of famous English river (4)
I believe the answer is:
ouse
'river' is the definition.
(Yorkshire river)
'section of famous english' is the wordplay.
'section of' says the answer is hidden in the clue.
'OUSE' is hidden in the letters of 'famous english'.
(Other definitions for ouse that I've seen before include "One of several rivers" , "Name of several English rivers" , "River at Bedford" , "York's river" , "Lewes's river" .)