Sort of cap covering a new cigar (9)

I believe the answer is:

panatella

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'cigar' is the definition.
(type of cigar)

'sort of cap covering a new' is the wordplay.
'sort of cap' becomes 'patella' (I can't explain this - if you can you should believe this answer much more).
'covering' means one lot of letters goes inside another.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'a'+'n'='an'
'patella' placed around 'an' is 'PANATELLA'.

Can you help me to learn more?

(Other definitions for panatella that I've seen before include "that's smoked" , "Slender cigar" , "Kind of cigar" , "Long, thin cigar" , "Type of cigar" .)

I've seen this clue in The Telegraph.

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