Alligator pear almost producing havoc before a party (7)
I believe the answer is:
avocado
'alligator pear' is the definition.
(synonyms)
'before a party' is the wordplay.
'before' becomes 'avoc' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'party' becomes 'do' (do is a kind of party).
'avoc'+'a'+'do'='AVOCADO'
'almost producing havoc' is the link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for avocado that I've seen before include "Fruity colour" , "Green-fleshed fruit" , "Dull greenish colour" , "Green - fruit eaten as a vegetable" , "Pear-shaped tropical fruit" .)