One supplying plug for engine you can pick up? (8)
I believe the answer is:
promoter
'one supplying plug' is the definition.
(a plug is a promotional item)
'for engine you can pick up?' is the wordplay.
I cannot quite understand how this works, but
'for' could be 'pro' (I've seen this before) and 'pro' is located in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for promoter that I've seen before include "One books entertainments" , "Organiser eg of boxing" , "Person seeking financial support" , "Sponsor" , "Find me in torpor like publicist of product" .)