Spring sap flows (3)
I believe the answer is:
spa
'spring' is the definition.
(spa can mean a mineral spring)
'sap flows' is the wordplay.
'flows' indicates an anagram (I've seen 'flowing' mean this).
'sap' with letters rearranged gives 'SPA'.
(Other definitions for spa that I've seen before include "Health and beauty treatment establishment" , "Watering place" , "Boston" , "here for healthy holiday" , "eg Bath" .)