Supplies expert with videos after Oscar loss (8)
I believe the answer is:
provides
'supplies expert' is the definition.
'provides' can be an answer for 'supplies' ('provide' can be a synonym of 'supply'). I'm not sure about the 'expert' bit.
'videos after oscar loss' is the wordplay.
I cannot really see how this works, but
an anagram of 'videos' is 'ovides' which is within the answer.
This explanation may well be incorrect...
'with' acts as a link.
Can you help me to learn more?
(Other definitions for provides that I've seen before include "Supplies, furnishes" , "Gives what is desired or needed" .)