Trade something sticky in queue (7,3)
I believe the answer is:
traffic jam
'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" .)