Indeed, cannot be poured off (8)
I believe the answer is:
decanted
'poured off' is the definition.
'decanted' can be an answer for 'poured' (decanting is a kind of pouring). I am not certain of the 'off' bit.
'indeed cannot' is the wordplay.
I cannot really understand how this works, but
'cannot' could be 'cant' (contraction) and 'cant' is located in the answer.
The remaining letters 'deed' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
'be' acts as a link.
Can you help me to learn more?
(Another definition for decanted that I've seen is " Poured wine in decadent manner".)