“Clandestinely” is a whole mouthful of flagrant consonants and syllables for a word intended to connote undercover, off-book, and prohibited activities. It reeks of spy craft and people acting in bad faith or at risk of discovery with all the nasty ramifications of exposure.
The secretive subterfuge undermines any benevolent intent. Clandestinely is a label of taint. Love affairs, corporate secrets, black ops and conspiracy: the word itself is implication, an indication of moral corruption. As intrigue, it is only intriguing for the glamour and glory of fictionalized heroes.