Weed gets steady supply (4)
I believe the answer is:
drip
'weed' is the definition.
(thesaurus)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for drip that I've seen before include "Fall as from leaky tap" , "Insubstantial person - trickle" , "Fall in drops - weedy bloke" , "Fall or let fall in drops" , "wet blanket" .)