Wiktionary
a. 1 (context idiomatic English) Under suspicion; subject to critical inspection. 2 (context idiomatic English) In controversial circumstances. adv. (context idiomatic English) In or into controversial circumstances.
Wikipedia
Under a Cloud is a 1937 British drama film directed by George King and starring Betty Ann Davies, Edward Rigby, Bernard Clifton, Brian Buchel and Peter Gawthorne. A man returns from Australia and tries to reconcile with his estranged family.
Under a Cloud is a 1916 book by Arthur Wright.on
Usage examples of "under a cloud".
The camp of the muddies was less than two miles into the swamp, in a part that lay under a cloud of thick mist, a stinking, whitish green fog that swirled around Ryan and the others as they crept closer.
He had a duty to himself, to his family, to the University, to his past job (even though he had left it under a cloud), to his country - and to the human race.
For this purpose he calls in the help of a brother, a ne'er-do-well, who has left his native country under a cloud.
Lord Cochrane had distinguished himself there, but Cochrane was under a cloud now.