Crazy nudist due to lose cap – becoming this? It’s inappropriate (8)
I believe the answer is:
unsuited
'it's inappropriate' is the definition.
(thesaurus)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for unsuited that I've seen before include "Mismatched" , "incompatible" , "United us, not being harmonious" , "United us, being not fit for" .)