Crossword Genius

Fifty-one pound fluid (6)

Ross

I believe the answer is:

liquid

'fluid' is the definition.
(I know that fluid can be written as liquid)

'fifty-one pound' is the wordplay.
'fifty' becomes 'li' (I've seen this in other clues).
'one pound' becomes 'quid' (UK slang for a pound).
'li'+'quid'='LIQUID'

(Other definitions for liquid that I've seen before include "Spendable" , "Such an easy source of funds" , "Neither gas nor solid" , "Sloppy" , "Neither sold nor gaseous" .)

I've seen this clue in the Sydney Morning Herald.
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