Crossword Genius

Is love gay, embracing male in a form of sexual union? (7)

Ross

I believe the answer is:

isogamy

'a form of sexual union?' is the definition.
(biological term)

'is love gay embracing male' is the wordplay.
'love' becomes 'o' (In tennis, 'love' means 'zero').
'embracing' means one lot of letters goes inside another.
'male' becomes 'm' (common abbreviation).
'gay' placed around 'm' is 'gamy'.
'is'+'o'+'gamy'='ISOGAMY'

'in' acts as a link.

(Another definition for isogamy that I've seen is " Form of sexual reproduction".)

I've seen this clue in The Independent.
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