Excluding guys in rubbish heap — they're amazing (9)
I believe the answer is:
phenomena
'amazing' is the definition.
The answer and definition are not the same part of speech.
'excluding guys in rubbish heap' is the wordplay.
'excluding' becomes 'no'.
'guys' becomes 'men' (guy can mean a man).
'in' means one lot of letters goes inside another.
'rubbish' indicates anagramming the letters (a poor quality or rubbish spelling of the letters).
'no'+'men'='nomen'
'heap' is an anagram of 'phea'.
'nomen' put within 'phea' is 'PHENOMENA'.
'they're' acts as a link.
Can you help me to learn more?
(Other definitions for phenomena that I've seen before include "sensations" , "He-man open to remarkable things or wonders" , "Observable occurrences" , "Remarkable events or things, wonders (9)" , "They happen" .)