Weird crap covered by national broadcaster (6)
I believe the answer is:
spooky
'weird' is the definition.
(I've seen this before)
'crap covered by national broadcaster' is the wordplay.
'crap' becomes 'poo' (both can mean faeces).
'covered by' means one lot of letters goes inside another.
'national broadcaster' becomes 'sky' (Sky is a television company. I am not sure about the 'national' bit.).
'poo' inserted within 'sky' is 'SPOOKY'.
Can you help me to learn more?
(Other definitions for spooky that I've seen before include "Eerie" , "Chilling" , "Rather frightening" , "Sinister, ghostly" , "weird" .)