Praises temperature sustained by unit's cold shower (10)
I believe the answer is:
hailstones
'cold shower' is the definition.
(shower of cold stones)
'praises temperature sustained by unit's' is the wordplay.
'praises' becomes 'hails' (hail can mean to praise or commend).
'temperature' becomes 't' (abbreviation).
'sustained by' means one lot of letters go next to another.
'unit's' becomes 'ones' ('one' can be a synonym of 'unit').
'hails'+'t'+'ones'='HAILSTONES'
(Other definitions for hailstones that I've seen before include "bad weather" , "cold fall" .)