Primed to confront healer that bandages (2,3,5)

I believe the answer is:

on the alert

I'm a little stuck... Click here to teach me more about this clue!

'primed' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'confront healer that bandages' is the wordplay.
'ON THE ALERT' is hidden within the letters.
But, I am unsure how this is indicated.

'to' acts as a link.

Can you help me to learn more?

(Other definitions for on the alert that I've seen before include "vigilant" , "Looking out" .)

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

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