Publicly decide about river (5)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
clyde
'river' is the definition.
(I know that Clyde is a river)
'publicly decide about' is the wordplay.
'about' says the answer is hidden in the clue (the clue goes around or about the answer).
'CLYDE' is hidden within 'publicly decide'.
(Other definitions for clyde that I've seen before include "Glasgow river" , "bank robber" , "Bonnie and --, outlaws" , "Glaswegian river" , "Criminal" .)