Robe from a jolly part of France lacking length (7)

I believe the answer is:

armoire

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'robe from a jolly part of france lacking length' is the definition.
I can't tell whether this defines the answer.

'robe from a jolly part of france lacking length' is the wordplay.
'robe from a jolly' becomes 'arm' (I can't justify this - if you can you should believe this answer much more).
'part of france' becomes 'loire' ('Loire' is part of 'france').
'lacking' suggests deleting specific letters.
'length' becomes 'l'.
'loire' with 'l' taken out is 'oire'.
'arm'+'oire'='ARMOIRE'

Can you help me to learn more?

(Other definitions for armoire that I've seen before include "Cabinet originally used for storing weapons" , "item of furniture" , "Large wardrobe or cabinet" , "Large wardrobe - more air (anag)" , "Cupboard" .)

I've seen this clue in The Telegraph.

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