Liberator freeing fifty as from thick treacle (5)
I believe the answer is:
moses
'liberator' is the definition.
(I've seen this before)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for moses that I've seen before include "Hebrew leader and lawgiver" , "one found in bulrushes, too" , "One given tablets" , "Great Jewish leader who led the flight from Egypt" , "Mountain climber" .)