Crossword Genius

Could clothing be appropriate? (4)

Ross

I believe the answer is:

suit

I'm a little stuck... Click here to teach me more about this clue!

'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?)" .)

I've seen this clue in the Sydney Morning Herald.
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