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I'm gay, so in need of modific­ation for reproductive method (7)

Ross

I believe the answer is:

isogamy

I'm a little stuck... Click here to teach me more about this clue!

'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".)

I've seen this clue in The Guardian.
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