Foam that will hiss and splash up over me (5)
I believe the answer is:
spume
'foam that will hiss' is the definition.
'spume' can be an answer for 'foam' (spume is a kind of foam). I'm unsure of the rest of the definition.
'splash up over me' is the wordplay.
'splash' becomes 's' (this could be a standard abbreviation which I don't know about).
'over' shows that the letters should be reversed in order.
'up' back-to-front is 'pu'.
's'+'pu'+'me'='SPUME'
'and' is the link.
Can you help me to learn more?
(Other definitions for spume that I've seen before include "Sea foam, froth" , "Surf" , "Foam on waves" , "Froth on waves" .)