Isn't adopting expression of disgust for nothing (6)
I believe the answer is:
nought
'nothing' is the definition.
(synonyms)
'isn't adopting expression of disgust' is the wordplay.
'isn't' becomes 'not' (I can't explain this - if you can you should believe this answer much more).
'adopting' indicates putting letters inside (inserted letters are taken on or adopted).
'expression of disgust' becomes 'ugh' (I've seen this before).
'not' placed around 'ugh' is 'NOUGHT'.
'for' is the link.
Can you help me to learn more?
(Other definitions for nought that I've seen before include "Poetically nothing" , "Zero" , "The figure 0" , "Go hunt for nothing" , "The digit 0" .)