Cigar and nuts for earl (8)

I believe the answer is:

cardigan

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'earl' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

'cigar and nuts' is the wordplay.
'nuts' indicates an anagram (nuts can mean crazy).
'cigar'+'and'='cigarand'
'cigarand' anagrammed gives 'CARDIGAN'.

'for' is the link.

Can you help me to learn more?

(Other definitions for cardigan that I've seen before include "location of Welsh bay" , "Knitted jumper with buttons" , "One making ridiculous charge" , "Welsh town; garment" , "town in Wales" .)

I've seen this clue in The Sun.

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