My breeding activity’s frowned upon, possibly producing ultra-deer? (9)
I believe the answer is:
adulterer
'my breeding activity's frowned upon' is the definition.
I can't judge whether this definition defines the answer.
'producing ultra-deer?' is the wordplay.
'producing' indicates an anagram.
'ultra'+'deer'='ultradeer'
'ultradeer' is an anagram of 'ADULTERER'.
'possibly' acts as a link.
Can you help me to learn more?
(Other definitions for adulterer that I've seen before include "Man who cheats on his wife" , "Sinner" , "Durer tale (anag)" , "Perhaps playboy" , "Man United playing away" .)