I'd try out couch that's blue and disgusting? (5,4)
I believe the answer is:
dirty word
'blue and disgusting?' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.
'i'd try out couch' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'couch' becomes 'word' (I can't explain this - if you can you should give a lot more credence to this answer).
'id'+'try'='idtry'
'idtry' anagrammed gives 'dirty'.
'dirty'+'word'='DIRTY WORD'
'that's' is the link.
Can you help me to learn more?
(Other definitions for dirty word that I've seen before include "What profit is to a communist" , "said to be shocking?" , "(Expletive deleted!)" .)