Turf out of small hospital room (5)
I believe the answer is:
sward
'turf' is the definition.
('sward' can be a synonym of 'turf')
'small hospital room' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'hospital room' becomes 'ward' (I've seen this before).
's'+'ward'='SWARD'
'out of' acts as a link.
(Other definitions for sward that I've seen before include "Ground covered by a mat of grass and grass roots" , "Stretch of turf or grass" , "green turf?" , "Area of short grass" , "Extent of grass" .)