Hard work removing new bit of hair in jam (8)
I believe the answer is:
gridlock
'jam' is the definition.
(a traffic jam)
'hard work removing new bit of hair' is the wordplay.
'hard work' becomes 'grind' (I've seen this before).
'removing' is a deletion indicator.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'bit of hair' becomes 'lock' (a lock is a bunch of hair).
'grind' with 'n' taken away is 'grid'.
'grid'+'lock'='GRIDLOCK'
'in' is the link.
(Other definitions for gridlock that I've seen before include "Severe traffic congestion" , "Dense, motionless traffic" , "Standstill" , "Extensive traffic jam" , "Traffic snarl-up" .)