Record spread of congestion (3,3)
I believe the answer is:
log jam
'congestion' is the definition.
(log jam is a type of blockage)
'record spread' is the wordplay.
'record' becomes 'log' (logging is a kind of recording).
'spread' becomes 'jam'.
'log'+'jam'='LOG-JAM'
'of' is the link.
(Other definitions for log jam that I've seen before include "what prevents progress" , "hindrance to progress" , "Blockage of progress" , "Gridlock" , "Deadlock; river blockage" .)