Crossword Genius

One holding the record for a flight (5,3)

Ross

I believe the answer is:

black box

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This clue could be a double definition.

'one holding the record' is the first definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

'flight' is the second definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'for a' acts as a link.

Can you help me to learn more?

(Other definitions for black box that I've seen before include "Electronic device in aircraft recording flight information" , "Aircraft's flight recorder" , "Flight data recorder" , "It contains information about an air crash" , "Plane's flight recorder" .)

I've seen this clue in the Evening Standard.
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