On the radio, setter had a clue type getting blanket coverage (9)
I believe the answer is:
eiderdown
'blanket coverage' is the definition.
'eiderdown' can be an answer for 'blanket' (thesaurus). I'm not certain of the 'coverage' bit.
'on the radio setter had a clue type' is the wordplay.
'on the radio' indicates a 'sounds like' (homophone) clue.
'setter had' becomes 'I'd' (I had - referring to the crossword setter).
'clue type' becomes 'down' (crosswords!).
'id'+'a'='ida'
'ida' sounds like 'eider'.
'eider'+'down'='EIDERDOWN'
'getting' is the link.
Can you help me to learn more?
(Other definitions for eiderdown that I've seen before include "what ducks have to offer us" , "what may be on tonight" , "thermal insulation" , "cover when retired" , "Feather quilt" .)