Jam container, brass (10)
I believe the answer is:
bottleneck
'jam' is the definition.
(I've seen this before)
'container brass' is the wordplay.
'container' becomes 'bottle' (bottle is a kind of container).
'brass' becomes 'neck' (both can mean insolence).
'bottle'+'neck'='BOTTLENECK'
(Other definitions for bottleneck that I've seen before include "Constricted section of road" , "may cause delay" , "Part of glass container" , "in which jam is concentrated?" , "Congestion" .)