A well-endowed resort (3)
I believe the answer is:
spa
This clue could be a double definition.
'a well' is the first definition.
(both can mean a spring or water source)
'endowed resort' is the second definition.
'spa' can be an answer for 'resort' (spa is a kind of resort). I'm not certain of the 'endowed' bit.
Can you help me to learn more?
(Other definitions for spa that I've seen before include "Heated bath" , "A therapeutic hot spring" , "Bath, possibly" , "Watering hole" , "Where people go for spring" .)