More than one leguminous plant is doing badly (7)

I believe the answer is:

indigos

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'more than one leguminous plant' is the definition.
I can't tell whether this defines the answer.

'is doing badly' is the wordplay.
'badly' is an anagram indicator (letters in the wrong order).
'is'+'doing'='isdoing'
'isdoing' is an anagram of 'INDIGOS'.

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I've seen this clue in The Independent.

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