Could clothing be appropriate? (4)
I believe the answer is:
suit
'could' is the definition.
The definition and answer can be both to do with fundamental existence as well as being verbs in their base form.
Perhaps there's a link between them I don't understand?
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for suit that I've seen before include "C, D, H or S" , "executive" , "Petition" , "See 1" , "Formal wear (for court action?)" .)