Video game company very upset faced with artist's terrible effects (7)
I believe the answer is:
ravages
'terrible effects' is the definition.
Although both the answer and definition are verbs in their -s form, I don't see how they can define each other.
'video game company very upset faced with artist's' is the wordplay.
'video game company' becomes 'sega' (I've seen this in another clue).
'very' becomes 'v' (common abbreviation).
'upset' shows that the letters should be reversed in order.
'faced with' says to put letters next to each other (some letters act as the front or face of the word).
'artist' becomes 'RA' (Royal Academician, member of Royal Academy of Arts).
'sega'+'v'='segav'
'segav' back-to-front is 'vages'.
'vages' put after 'ra' is 'RAVAGES'.
Can you help me to learn more?
(Other definitions for ravages that I've seen before include "Sacks" , "Causes great damage" , "a very bad series of effects" .)