Lieutenant Scheisskopf’s preparations were elaborate and clandestine.
’I don’t buy eggs in Malta,’ he confessed, with an air of slight and clandestine amusement that was the only departure from industrious sobriety Yossarian had ever seen him make.
All the next evening, people kept popping up at him out of the darkness to ask him how he was doing, appealing to him for confidential information with weary, troubled faces on the basis of some morbid and clandestine kinship he had not guessed existed.
There are no more uses of "clandestine" in the book.
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She is involved in clandestine intelligence operations.