Old king has trouble finding fabled artefact (5)

I believe the answer is:

grail

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

'fabled artefact' is the definition.
'grail' can be an answer for 'artefact' (grail is a kind of artefact). I'm not sure about the 'fabled' bit.

'old king has trouble' is the wordplay.
'old king' becomes 'GR' (Georgius Rex, Latin for King George).
'has' means one lot of letters go next to another.
'trouble' becomes 'ail' (synonyms).
'gr'+'ail'='GRAIL'

'finding' acts as a link.

Can you help me to learn more?

(Other definitions for grail that I've seen before include "Object of knightly quest" , "Chalice used by Jesus at the Last Supper" , "Last Supper cup" , "Holy object of search" , "what some look for" .)

I've seen this clue in The Mirror.

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