Hit barrier when going to work (6)
I believe the answer is:
wallop
'hit' is the definition.
(I know that wallop is a more specific form of hit)
'barrier when going to work' is the wordplay.
I cannot quite see how this works, but
'barrier' could be 'wall' (a wall acts as a barrier) and 'wall' is present in the answer.
'work' could be 'op' (abbreviation for opus) and 'op' is found within the answer.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for wallop that I've seen before include "A heavy resounding blow (6)" , "Thrash - beer (slang)" , "Hit - the booze?" , "Severe blow" , "batter" .)