No robe for the fairy king (6)

I believe the answer is:

oberon

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

'the fairy king' is the definition.
(Oberon is a mythical fairy king)

'no robe' is the wordplay.
'no robe' anagrams to 'OBERON'.
However, I'm not sure how the anagram is indicated.

'for' is the link.

Can you help me to learn more?

(Other definitions for oberon that I've seen before include "Play King" , "Fairy king (AMND)" , "MND fairy king" , "charming king" , "Titania's husband" .)

I've seen this clue in The Irish News.

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