I'm gay, so in need of modification for reproductive method (7)
I believe the answer is:
isogamy
'reproductive method' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.
'i'm gay so in need of modification' is the wordplay.
'in need of modification' is an anagram indicator.
'im'+'gay'+'so'='imgayso'
'imgayso' with letters rearranged gives 'ISOGAMY'.
'for' is the link.
Can you help me to learn more?
(Another definition for isogamy that I've seen is " Form of sexual reproduction".)