Recycled waste which astronauts eventually drink (5)
I believe the answer is:
sweat
'astronauts eventually drink' is the definition.
I can't tell whether this defines the answer.
'recycled waste' is the wordplay.
'recycled' is an anagram indicator.
'waste' is an anagram of 'SWEAT'.
'which' is the link.
Can you help me to learn more?
(Other definitions for sweat that I've seen before include "Waste (anag.)" , "Male perspiration?" , "It's hard work" , "Toil" , "(Of argument) intense" .)