Pass around drains (4)
I believe the answer is:
saps
'drains' is the definition.
(sapping is a kind of draining)
'pass around' is the wordplay.
'around' indicates an anagram.
'pass' anagrammed gives 'SAPS'.
(Other definitions for saps that I've seen before include "Vital juices" , "Pass around foolish people" , "Drains energy from" , "Coshes" , "More than one fool" .)