North American stinger? Eccentric chewed it (8)

I believe the answer is:

itchweed

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'north american stinger? eccentric chewed it' is the definition.
I can't judge whether this defines the answer.

'eccentric chewed it' is the wordplay.
'eccentric' is an anagram indicator.
'chewed'+'it'='chewedit'
'chewedit' is an anagram of 'ITCHWEED'.

Can you help me to learn more?

(Another definition for itchweed that I've seen is " US plant".)

I've seen this clue in The Guardian.

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