Fix me up somewhere to sleep (5)
I believe the answer is:
embed
'fix' is the definition.
(to embed is to fix in place)
'me up somewhere to sleep' is the wordplay.
'up' says the letters should be written in reverse (in down clue: letters go upwards).
'somewhere to sleep' becomes 'bed'.
'me' written backwards gives 'em'.
'em'+'bed'='EMBED'
(Other definitions for embed that I've seen before include "Fix fast in something solid" , "Surround" , "Fix firmly (in ground)" , "bringing plant inside" , "Plant firmly" .)