Crossword Genius

Let fifty relax (5)

Ross

I believe the answer is:

lease

'let' is the definition.
(as in to lease or let a building)

'fifty relax' is the wordplay.
'fifty' becomes 'l' (Roman numeral).
'relax' becomes 'ease' (eg to ease a restriction is to relax it).
'l'+'ease'='LEASE'

(Other definitions for lease that I've seen before include "Hire out, rent" , "Contract to rent" , "Rent -- easel (anag)" , "Property rental agreement" , "Term of a rental contract" .)

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