Crossword Genius

Key organisation backed watered-down measures (4)

Ross

I believe the answer is:

grog

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'key organisation backed watered-down measures' is the definition.
I can't tell whether this definition defines the answer.

'key organisation backed' is the wordplay.
'key' becomes 'g' (musical key).
'organisation' becomes 'org' (common abbreviation).
'backed' shows that the letters should be reversed in order.
'g'+'org'='gorg'
'gorg' written backwards gives 'GROG'.

Can you help me to learn more?

(Other definitions for grog that I've seen before include "Mixture of spirit and water" , "Booze" , "Old naval drink" , "Rum mixed with water" , "Nautical drink" .)

I've seen this clue in The Independent.
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