Dismiss clerking interns with smug smile (5)

I believe the answer is:

smirk

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

'smug smile' is the definition.
(I've seen this in another clue)

I can't explain the remainder of the clue.

(Other definitions for smirk that I've seen before include "Compacent smile" , "Show self-complacent satisfaction" , "Simper" , "Leer" , "Self-satisfied grin" .)

I've seen this clue in The Irish Times.

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