Crossword Genius

Trade something sticky in queue (7,3)

Ross

I believe the answer is:

traffic jam

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'queue' is the definition.
The answer and definition can be both groups as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'trade something sticky' is the wordplay.
'trade' becomes 'traffic' (trafficking is a kind of trading).
'something sticky' becomes 'jam' (jam is a sticky substance).
'traffic'+'jam'='TRAFFIC JAM'

'in' acts as a link.

Can you help me to learn more?

(Other definitions for traffic jam that I've seen before include "could make driver late" , "Problem, in a way" , "Vehicular snarl-up" , "It causes a hold-up" , "Bottleneck on wheels" .)

I've seen this clue in The Telegraph.
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