End rivet wrongly fixed upside down (8)
I believe the answer is:
inverted
'upside down' is the definition.
(I've seen this before)
'end rivet wrongly' is the wordplay.
'wrongly' indicates anagramming the letters.
'end'+'rivet'='endrivet'
'endrivet' with letters rearranged gives 'INVERTED'.
'fixed' acts as a link.
This may not be right. It may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for inverted that I've seen before include "Turned upside down" , "Upside-down" , "Upturned" .)