Crossword Genius

Police in river to reach conclusion (6)

Ross

I believe the answer is:

decide

I'm a little stuck... Click here to teach me more about this clue!

'to reach conclusion' is the definition.
I can't tell whether this defines the answer.

'police in river' is the wordplay.
'police' becomes 'CID' (abbreviation for Criminal Investigation Department).
'in' indicates putting letters inside.
'river' becomes 'dee' (River Dee).
'cid' going within 'dee' is 'DECIDE'.

Can you help me to learn more?

(Other definitions for decide that I've seen before include "Judge" , "Choose" , "Adjudicate" , "Make a judgment" , "Reach a conclusion" .)

I've seen this clue in The Sun.
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