Crossword Genius

Only fifty-one (4)

Ross

I believe the answer is:

lone

'only' is the definition.
(I know that only can be written as lone)

'fifty-one' is the wordplay.
'fifty' becomes 'L' (Roman numeral).
'l'+'one'='LONE'

(Other definitions for lone that I've seen before include "Companionless" , "Solitary, sounds like advance" , "Solitary or single" , "Unaccompanied" , "Sole" .)

I've seen this clue in the Evening Standard.
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