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Bugs
Bunny’s
first
song
about
carrot
extremely
emotional
at
first
(8)
Bugs Bunny’s first song about carrot extremely emotional at first (8)
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The definition is at the beginning of the clue.
How the clue works
Look at Bugs — that's your definition, since bugs are bacteria. Now for the wordplay: take B (first letter of Bunny) and then ARIA (song) wrapped *about* C (first letter of carrot), giving you B + A(C)TERIA... but wait, there's still T (the last letter — the *extreme* — of "emotional") and E (*at first* from "emotional") slotted in there too, so the whole thing builds out as BACTERIA.