Hire large facility (5)
I believe the answer is:
lease
'hire' is the definition.
(I know that hire can be written as lease)
'large facility' is the wordplay.
'large' becomes 'L' (eg in clothes sizes).
'facility' becomes 'ease' (I've seen this before).
'l'+'ease'='LEASE'
(Other definitions for lease that I've seen before include "Rent -- easel (anag)" , "Hire out, rent" , "Let out, hire" , "Term of a rental contract" , "Tenancy contract" .)