It flows in picturesque parts (3)
I believe the answer is:
ure
'it flows' is the definition.
I don't know anything about this answer so I can't tell whether this works.
'in picturesque parts' is the wordplay.
'in' says the answer is hidden in the clue.
'URE' is hidden in the letters of 'picturesque parts'.
Can you help me to learn more?
(Other definitions for ure that I've seen before include "Wensleydale river" , "River of N. Yorkshire" , "North Yorkshire river" , "River at Ripon" , "Ripon's river" .)