Out of gear (4)
I'm afraid I can't even guess how this answer relates to the clue.
Can you help me to learn more?
(Another definition for in the nude that I've seen is " Naked".)
This might be a double definition.
'out' is the first definition.
Both the answer and definition are adjectives. Perhaps there's a link between them I don't understand?
'gear' is the second definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe you can see a link between them that I don't see?
'of' acts as a link.
Can you help me to learn more?
(Other definitions for nude that I've seen before include "Having nothing on" , "Without cover" , "totally exposed" , "revealing all" , "Naked figure" .)