Wader in water gently reels a bit (5)
I believe the answer is:
egret
'wader' is the definition.
(egret is a kind of wader)
'water gently reels a bit' is the wordplay.
'EGRET' is hidden back-to-front in amongst the letters.
However, I'm not sure how this is indicated.
'in' acts as a link.
Can you help me to learn more?
(Other definitions for egret that I've seen before include "young bird" , "Bird eating fish" , "Mainly white heron" , "Type of forty eight Ac" , "Type of heron" .)