Commotion with gull circling field next to river (6)
I believe the answer is:
meadow
'field next to river' is the definition.
I can't tell whether this definition defines the answer.
'commotion with gull circling' is the wordplay.
'commotion with' becomes 'ado' (I can't justify this - if you can you should give a lot more credence to this answer).
'gull' becomes 'mew gull' (mew is a kind of gull).
'circling' means one lot of letters goes inside another (circling can mean going around or containing).
'ado' placed within 'mew' is 'MEADOW'.
Can you help me to learn more?
(Other definitions for meadow that I've seen before include "Hayfield" , "Low-lying grassland" , "Pasture" , "In rural location" , "Lea" .)