Crossword Genius

Right on a length (5)

Ross

I believe the answer is:

legal

'right' is the definition.
(legal right is a kind of right)

'on a length' is the wordplay.
'on' becomes 'leg' (cricket term, fielding positions).
'length' becomes 'l'.
'leg'+'a'+'l'='LEGAL'

(Other definitions for legal that I've seen before include "Compliant with the law" , "associated with silk business?" , "Within bounds of law" , "Sound" , "It's acceptable" .)

I've seen this clue in The Sun and The Independent.
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