Dim old monarch boarding vacant buggy (6)

I believe the answer is:

bleary

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

'dim' is the definition.
(I've seen this before)

'old monarch boarding vacant buggy' is the wordplay.
'old monarch' becomes 'lear' (King Lear. I am not sure about the 'old' bit.).
'boarding' is an insertion indicator.
'vacant' suggests removing the centre.
'buggy' with its centre taken out is 'by'.
'lear' going inside 'by' is 'BLEARY'.

Can you help me to learn more?

(Other definitions for bleary that I've seen before include "Dim" , "Smudged, indistinct" , "Dulled with fatigue" , "Unable to see properly" , "not clear" .)

I've seen this clue in The Telegraph.

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