It flows into a wide estuary (3)

I believe the answer is:

dee

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'it flows' is the definition.
The definition suggests a singular noun which matches the answer.

'into a wide estuary' is the wordplay.
'into' says the answer is hidden in the clue.
'DEE' is hidden in the letters of 'wide estuary'.

Can you help me to learn more?

(Other definitions for dee that I've seen before include "Welsh river" , "John ---, Elizabethan mage" , "Scottish river" , "Aberdeenshire river" , "Balmoral's river" .)

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