Idiot lord in court turned up fat (7)

I believe the answer is:

dullard

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'idiot' is the definition.
(I know that idiot can be written as dullard)

'lord in court turned up fat' is the wordplay.
'lord in court' becomes 'lud' (I can't explain this - if you can you should give a lot more credence to this answer).
'turned up' says the letters should be written backwards.
'fat' becomes 'lard' (lard is a kind of fat).
'lud' backwards is 'dul'.
'dul'+'lard'='DULLARD'

Can you help me to learn more?

(Other definitions for dullard that I've seen before include "Slow or stupid person" , "Boring person" , "A mentally slow person" , "Dope" , "Stupid fellow" .)

I've seen this clue in The Times.

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