Whereat there's a solid use for water (5)
I believe the answer is:
lidos
'whereat there's a' is the definition.
I can't tell whether this defines the answer.
'solid use for water' is the wordplay.
'solid' can be anagrammed to 'LIDOS'.
Though, I'm unsure how this is indicated.
Can you help me to learn more?
(Other definitions for lidos that I've seen before include "bathing beaches" , "Open-air swimming pools" , "which swimmers may use" , "Open air swimming pools" , "leisure facilities" .)