Crossword Genius

King meeting maniac regularly for fun (5)

Ross

I believe the answer is:

craic

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'fun' is the definition.
Both the definition and answer are adjectives.
Maybe they are linked in a way I don't understand?

'king meeting maniac regularly' is the wordplay.
'king' becomes 'CR' (short for Carolus Rex, King Charles in Latin).
'meeting' means one lot of letters go next to another.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
The alternate letters of 'maniac' are 'aic'.
'cr'+'aic'='CRAIC'

'for' is the link.

Can you help me to learn more?

(Other definitions for craic that I've seen before include "Irish pub fun?" , "good time" , "In Irish bars you'll get this" .)

I've seen this clue in The Independent.
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