Legal discrepancy lets one perform aerobatic manoeuvre while taking pot (8)
I believe the answer is:
loophole
'pot' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe you can see an association between them that I can't see?
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for loophole that I've seen before include "Exploited legal ambiguity" , "Means to escape" , "Way of evading a rule or contract" , "Mistake in legislation" , "way to escape penalty" .)