Fascinating job for metalworkers! (8)
I believe the answer is:
riveting
I believe this clue is a double definition.
'fascinating' is the first definition.
(synonyms)
'job for metalworkers' is the second definition.
(to rivet is to fasten bits of metal together)
(Other definitions for riveting that I've seen before include "Completely engrossing" , "Gripping - securing with metal pins" , "Holding attention" , "Fascinating, fixing the attention" , "metalwork" .)