Do Something Secretly, in an Underhanded Way
This page is the CodyCross answer for the clue below from Top Secret, Group 2089, Puzzle 5 (Stealth Mode).
Question is: Do Something Secretly, in an Underhanded Way
and the answer is: ONTHESLY
Word Meaning:
ON THE SLY — (idiomatic) Slyly, in an inconspicuous manner, so as not to be seen; secretly; stealthily.
Definitions from Wiktionary.