Crossword Genius

While searching, three of the users oddly leave secretly (2,3,1,1)

Ross

I believe the answer is:

on the q t

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

'secretly' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Another definition for on the q t that I've seen is " Secretly".)

I've seen this clue in The Hindu.
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