It's a wonder he works (8)
I believe the answer is:
magician
'it's a wonder he works' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'he works' is the wordplay.
I cannot really understand how this works, but
'he' could be 'ian' and 'ian' is found in the answer.
The remaining letters 'magic' is a valid word which might be clued in a way I don't understand.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for magician that I've seen before include "Conjuror or sorcerer" , "Stage conjurer or maker of legerdemain" , "Wizard like cartoon Mandrake" , "Person with a wand or rabbit in his hat?" , "Sorcerer, wizard" .)