Manual worker given dreadful roasting (8)
I believe the answer is:
organist
'manual worker' is the definition.
(musician working with their hands)
'dreadful roasting' is the wordplay.
'dreadful' is an anagram indicator.
'roasting' is an anagram of 'ORGANIST'.
'given' acts as a link.
(Other definitions for organist that I've seen before include "Roasting (anag)" , "One plays in church usually" , "Church instr. player" , "Cathedral musician" , "It groans for church musician" .)