Get south from the west, and there you are in the sea! (3)
I believe the answer is:
wet
'get' is the definition.
The answer and definition can be both related to change as well as being verbs in their base form.
Maybe there's a link between them I don't understand?
'south from the west and there you are in the sea' is the wordplay.
I cannot quite understand how this works, but
'from' could be 'e' (I've seen this in other clues) and 'e' is found in the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is found within the answer.
'west' could be 'w' (abbreviation) and 'w' is found within the answer.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for wet that I've seen before include "Rainy (weather)" , "Irresolute" , "Saturated with liquid" , "Moisture; feeble (colloq.)" , "Soaked with water" .)