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Black-eyed Susan, environmental activist and international ace (10)

Ross

I believe the answer is:

thunbergia

'black-eyed susan' is the definition.
(the genus Thunbergia includes black-eyed Susan)

'environmental activist and international ace' is the wordplay.
'environmental activist' becomes 'Thunberg' (environmental activist Greta Thunberg).
'and' means one lot of letters go next to another.
'international' becomes 'i' (abbreviation eg in IMF).
'ace' becomes 'a'.
'thunberg'+'i'+'a'='THUNBERGIA'

I've seen this clue in The Guardian.
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