Sheep runs that may hold water (4)
I believe the answer is:
ewer
'may hold water' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
'sheep runs' is the wordplay.
'sheep' becomes 'ewe' (a ewe is a female sheep).
'runs' becomes 'r' (cricket abbreviation).
'ewe'+'r'='EWER'
'that' acts as a link.
Can you help me to learn more?
(Other definitions for ewer that I've seen before include "Water-jar" , "Were (anag)" , "Sort of jug" , "from which liquid may be poured" , "Open vessel with handle and spout" .)