Caught Alan wasting some water (5)
I believe the answer is:
canal
'some water' is the definition.
(canal is a kind of water)
'caught alan wasting' is the wordplay.
'caught' becomes 'c' (cricket abbreviation).
'wasting' is an anagram indicator (waste can mean to destroy).
'alan' is an anagram of 'anal'.
'c'+'anal'='CANAL'
(Other definitions for canal that I've seen before include "navigate this?" , "Aqueduct" , "Artificial waterway as at Panama (5)" , "Passage" , "Duct" .)