Gem I can’t reproduce with the power of a drawing instrument (8)
I believe the answer is:
magnetic
'power of a drawing instrument' is the definition.
Both the definition and answer are adjectives. Perhaps there's a link between them I don't understand?
'gem i can't reproduce' is the wordplay.
'reproduce' indicates an anagram.
'gem'+'i'+'cant'='gemicant'
'gemicant' is an anagram of 'MAGNETIC'.
'with the' is the link.
Can you help me to learn more?
(Other definitions for magnetic that I've seen before include "Attracting iron or steel" , "Having the power to attract" , "Very attractive or alluring" , "Able to attract metal, or charismatic" , "What's attractive" .)