Wonderful old king - not hard to get small cloths (7)

I believe the answer is:

fabrics

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'cloths' is the definition.
('fabric' can be a synonym of 'cloth')

'wonderful old king' is the wordplay.
'wonderful' becomes 'fab' (slang abbreviation of fabulous).
'old king' becomes 'rics' (I can't justify this - if you can you should believe this answer much more).
'fab'+'rics'='FABRICS'

'not hard to get small' is the link.
This may not be right. Some or all of it may belong to another bit of the clue.

Can you help me to learn more?

(Another definition for fabrics that I've seen is " Materials".)

I've seen this clue in The Daily Express.

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