Broadcaster assuming setter had died is treacherous (6)
I believe the answer is:
skiddy
'treacherous' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.
'broadcaster assuming setter had died' is the wordplay.
'broadcaster' becomes 'sky' (Sky is a television company).
'assuming' indicates putting letters inside (inserted letters are taken in or assumed).
'setter had' becomes 'I'd' ('I'd' refers to the person writing the clues).
'died' becomes 'd' (abbreviation next to the year of someone's death).
'id'+'d'='idd'
'sky' going around 'idd' is 'SKIDDY'.
'is' acts as a link.
Can you help me to learn more?
(Other definitions for skiddy that I've seen before include "Slippery" , "having little traction" .)