Healing copper with Covid test I have (8)

I believe the answer is:

curative

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'healing' is the definition.
(I know that healing can be written as curative)

'test i have' is the wordplay.
'test' becomes 'curat' (I am not sure about this - if you are sure you should believe this answer much more).
'i have' becomes 'I've' (contraction of 'I have').
'curat'+'ive'='CURATIVE'

'copper with covid' acts as a link.
This may not be right. Some or all of it may be part of another bit of the clue.

Can you help me to learn more?

(Other definitions for curative that I've seen before include "Restoring to health" , "health-giving" , "Therapeutic" , "Healing" , "Medicine" .)

I've seen this clue in the Sydney Morning Herald.

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