immovable pileup (6)
I believe the answer is:
logjam
(Other definitions for logjam that I've seen before include "deadlock" , "blockage" , "bottleneck" , "impasse" , "Major stoppage" .)
I believe the answer is:
logjam
(Other definitions for logjam that I've seen before include "deadlock" , "blockage" , "bottleneck" , "impasse" , "Major stoppage" .)