To tantalise the left is a plant (6)

I believe the answer is:

teasel

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Here is my best explanation:

'a plant' is the definition.

(teasel is a kind of plant)

'to tantalise the left' is the subsidiary indication.

'to tantalise' becomes 'tease' (teasing is a kind of tantalizing).

'the left' becomes 'l' (common abbreviation).

'tease'+'l'='teasel'

'is' is the link.

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(Other definitions for teasel that I've seen before include "Elates with nap-brushing device", "Sat eel up on the herb", "Eel sat up on the plant", "Plant with prickly flower heads", "Herb with prickly flower heads -- elates (anag)", "Plant with prickly flower head", "Prickly plant - elates (anag)", "Plant with spiny purple flower heads", "Prickly plant (S, not Z)" and "Prickly wild plant".)

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