Nominally he works in lead (6)
I believe the answer is:
daniel
'nominally he' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'works in lead' is the wordplay.
'works' indicates an anagram (work can mean to twist or convulse).
'in'+'lead'='inlead'
'inlead' is an anagram of 'DANIEL'.
Can you help me to learn more?
(Other definitions for daniel that I've seen before include "Biblical prophet thrown into the lion's den" , "-- Craig, Bond actor" , "Make larger" , "He interpreted Belshazzar's fate" , "He did time in a den of lions" .)