It tastes hot and makes many unwell (4)

I believe the answer is:

dill

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'it tastes hot and' is the definition.
The definition suggests a singular noun which matches the answer.

'many unwell' is the wordplay.
'many' becomes 'd' ().
'unwell' becomes 'i'll' (similar in meaning).
'd'+'ill'='DILL'

'makes' acts as a link.

Can you help me to learn more?

(Other definitions for dill that I've seen before include "Herb of parsley family" , "Pickling herb" , "Culinary herb" , "Herb; rhymes with beak" , "Herb for gravadlax" .)

I've seen this clue in The Globe and Mail.

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