Woodwind section standing by the river (5)
I believe the answer is:
'by the river' is the definition.
I can't judge whether this defines the answer.
'woodwind section standing' is the wordplay.
'woodwind' becomes 'reed' (reed is a kind of woodwind).
'standing' suggests taking the first letters.
The initial letter of 'section' is 's'.
Can you help me to learn more?
(Other definitions for reeds that I've seen before include "They vibrate to produce the sound of various musical instruments" , "pens for sheep" , "Tall stiff marsh grasses" , "Stops" , "Thin pieces of cane in musical instruments" .)