Drain exploded: low point found (5)
I believe the answer is:
nadir
'low point found' is the definition.
I can't tell whether this definition defines the answer.
'drain exploded' is the wordplay.
'exploded' indicates anagramming the letters.
'drain' is an anagram of 'NADIR'.
Can you help me to learn more?
(Other definitions for nadir that I've seen before include "Drain to lowest level" , "Low spot" , "Low point" , "Given lowest place" , "Drain (anag)" .)