I can see what’s coming - end of sheep, sheep in stream turning turtle (9)

'i can see what's' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'end of sheep sheep in stream turning turtle' is the wordplay.
'end of' suggests the final letters.
'sheep' becomes 'ewe' (a ewe is a female sheep).
'in' means one lot of letters goes inside another.
'stream' becomes 'river' (river is a kind of stream).
'turning turtle' shows that the letters should be reversed in order (to turn turtle is to turn upside down).
The last letter of 'sheep' is 'p'.
'ewe' put into 'river' is 'reweiver'.
'reweiver' reversed gives 'reviewer'.
'p'+'reviewer'='PREVIEWER'

'coming' acts as a link.

Can you help me to learn more?