I will be briefly unwell (3)

I believe the answer is:

ill

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This might be a double definition.

'i will' is the first definition.
(abbreviation)

'briefly unwell' is the second definition.
'ill' can be an answer for 'unwell' (similar in meaning). I'm unsure of the 'briefly' bit.

'be' acts as a link.

Can you help me to learn more?

(Other definitions for ill that I've seen before include "Badly diminished" , "Faulty" , "Not well, sick" , "Out of sorts" , "state, briefly" .)

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

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