One holds books in mess at Chelsea (7)

I believe the answer is:

satchel

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'one holds books in mess at chelsea' is the definition.
I can't judge whether this defines the answer.

'in mess at chelsea' is the wordplay.
'in' indicates the answer is hidden within the clue.
'SATCHEL' is hidden in the letters of 'mess at chelsea'.

Can you help me to learn more?

(Other definitions for satchel that I've seen before include "Carrier for school books" , "Bag -- latches (anag)" , "Get school item" , "Small case with a shoulder strap" , "Schoolbag for children's books" .)

I've seen this clue in The Sun.

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