Language in poetry extract reduced success (5)
I believe the answer is:
lingo
'language' is the definition.
(informal term for language)
'poetry extract reduced success' is the wordplay.
'poetry extract' becomes 'ling' (I am not sure about this - if you are sure you should believe this answer much more).
'reduced' means to remove the first letter.
'success' becomes 'go' (I've seen this in other clues).
'go' with its initial letter taken off is 'o'.
'ling'+'o'='LINGO'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for lingo that I've seen before include "strange language" , "Jargon, language (colloq.)" , "Vernacular" , "Foreign language or dialect: jargon" , "Language (slang)" .)