Gall is evident in smirking (3)

I believe the answer is:

irk

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

'gall' is the definition.
(I know that gall can be written as irk)

'evident in smirking' is the wordplay.
'IRK' is hidden in amongst the letters.
But, I'm unsure how this is indicated.

'is' is the link.

Can you help me to learn more?

(Other definitions for irk that I've seen before include "Annoy in quirky way" , "Bug" , "Get at" , "Gall" , "Severely annoy" .)

I've seen this clue in The Mirror.

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