An impostor's standard (5,7)
I believe the answer is:
false colours
If this is the answer, I'm afraid I cannot explain it.
Can you help me to learn more?
(Other definitions for false colours that I've seen before include "To sail under -- -- is to be deliberately deceiving" , "Misleading guise" .)
I've seen this clue in The Globe and Mail.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free.
Check out my app
or
learn more
about the Crossword Genius project.