Easily avoiding teacher’s attention (5,4)

I believe the answer is:

hands down

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

'easily' is the definition.
(synonyms)

I can't explain the rest of the clue.

(Other definitions for hands down that I've seen before include "Leaves - effortlessly" , "without effort" , "Common teaching command" , "with ease" , "six-thirty?" .)

I've seen this clue in the Evening Standard.

Want a hint initially instead of a full solution? Install my app