Wet through, took a seat; I hear you are at the end (8)
I believe the answer is:
saturate
'wet' is the definition.
(I've seen this before)
'through took a seat i hear you are at the end' is the wordplay.
'through' indicates putting letters inside (some letters go through others).
'took a seat' becomes 'sat' (I've seen this before).
'i hear' becomes 'rate' (I can't explain this - if you can you should believe this answer much more).
'are at the end' suggests the final letters.
The last letter of 'you' is 'u'.
'sat'+'rate'='satrate'
'satrate' enclosing 'u' is 'SATURATE'.
Can you help me to learn more?
(Other definitions for saturate that I've seen before include "Drench thoroughly, soak" , "Soak completely" , "flood" , "Use attar to make thoroughly wet" , "Make thoroughly wet, soak" .)