Verbose about river being green (6)

I believe the answer is:

grassy

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'green' is the definition.
(I've seen this in another clue)

'verbose about river being' is the wordplay.
'verbose' becomes 'gassy' (I've seen this before).
'about' indicates putting letters inside.
'river being' becomes 'r' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'gassy' placed around 'r' is 'GRASSY'.

Can you help me to learn more?

(Other definitions for grassy that I've seen before include "Naturally green?" , "Like lawns or pasture" .)

I've seen this clue in The Guardian.

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