Inappropriately form altered emphasis (8)
I believe the answer is:
misshape
'inappropriately form' is the definition.
The definition suggests a singular noun which matches the answer.
'altered emphasis' is the wordplay.
'altered' indicates an anagram.
'emphasis' anagrammed gives 'MISSHAPE'.
Can you help me to learn more?
(Other definitions for misshape that I've seen before include "Emphasis (anag.)" , "Fashion poorly" , "Deform" , "bad figure" , "How football appears to a rugby player" .)