Crossword Genius

Sneak attending class? (6)

Ross

I believe the answer is:

inform

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

'sneak' is the definition.
Although both the answer and definition are verbs in their base form, I can't see how they can define each other.

'attending class?' is the wordplay.
'attending' becomes 'in' (I've seen this in other clues).
'class?' becomes 'form' ('form' can be a synonym of 'class').
'in'+'form'='INFORM'

Can you help me to learn more?

(Other definitions for inform that I've seen before include "Enlighten" , "Put wise" , "Tell - shop" , "Brief" , "Give knowledge to" .)

I've seen this clue in The Sun.
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