Supplies the drugs for wedding band taken in by groom? Yes! (7)
I believe the answer is:
syringe
'supplies the drugs for wedding' is the definition.
I can't judge whether this defines the answer.
'band taken in by groom? yes' is the wordplay.
'band' becomes 'ring' ('ring' can be a synonym of 'band').
'taken in by' means one lot of letters goes inside another.
'groom?' is an anagram indicator (I've seen 'groom' mean this).
'yes' with letters rearranged gives 'sye'.
'ring' going into 'sye' is 'SYRINGE'.
Can you help me to learn more?
(Other definitions for syringe that I've seen before include "Instrument for injecting fluids" , "Injector" , "Tube for injections" , "Injection tool" , "one's prepared for a shot" .)