His ark could have been debonair! (6)

I believe the answer is:

rakish

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

'debonair' is the definition.
(I've seen this in another clue)

'his ark could have been' is the wordplay.
'his ark' can be anagrammed to 'RAKISH'.
But, I'm not clear how the anagram is indicated.

Can you help me to learn more?

(Other definitions for rakish that I've seen before include "Dashing and slightly disreputable" , "abandoned" , "Jaunty; dissolute" , "Jaunty; fast-looking (boat)" , "Given to philandering" .)

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

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