Material for hospital broadcast supports doctor (6)
I believe the answer is:
mohair
'material' is the definition.
(mohair is a kind of material)
'hospital broadcast supports doctor' is the wordplay.
'hospital' becomes 'h'.
'broadcast' becomes 'air' ('air' can be a synonym of 'broadcast').
'supports' is a charade indicator (letters next to each other) (bottom letters provide a support for the top ones).
'doctor' becomes 'mo' (medical officer**).
'h'+'air'='hair'
'hair' after 'mo' is 'MOHAIR'.
'for' is the link.
(Other definitions for mohair that I've seen before include "Fabric made from fine silky wool of goat" , "Fine goat's cloth" , "Fine silky hair of angora goat" , "Fine silky coat of angora goat" , "Angora fleece" .)