Let out water through conical structure (8)
I believe the answer is:
perspire
'let out water through conical structure' is the definition.
I can't judge whether this defines the answer.
'through conical structure' is the wordplay.
'through' becomes 'per' ('per' can mean through or by means of).
'conical structure' becomes 'spire' (spire is a kind of structure. I am not sure about the 'conical' bit.).
'per'+'spire'='PERSPIRE'
Can you help me to learn more?
(Other definitions for perspire that I've seen before include "Sweat politely" , "Exude" , "Sweat (as a lady does?)" , "Show effect of heat" , "Swelter" .)