Crossword Genius

Take the late red-eye that's unreliable? (3-2-5)

Ross

I believe the answer is:

fly-by-night

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'unreliable?' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

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(Other definitions for fly-by-night that I've seen before include "Untrustworthy person, likely to abscond" , "Cowboy" , "Unreliable, shady" , "Unreliable (in business)" , "Unreliable - person who departs secretly to avoid debts" .)

I've seen this clue in The Independent.
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