Thanks to the rain, he’s got lots of water around! (3)
I believe the answer is:
tar
'he's got lots of water around' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'thanks to the rain' is the wordplay.
'thanks' becomes 'ta' (UK informal version of 'thank you').
'to' is a charade indicator (letters next to each other).
'the rain' becomes 'r' (this might be a standard abbreviation which I don't know about).
'ta'+'r'='TAR'
Can you help me to learn more?
(Other definitions for tar that I've seen before include "Tobacco residue; sailor" , "'Thick, dark, sticky liquid (3)'" , "Product of coal" , "Sticky black stuff" , "Old salt, sailor" .)