This set of rooms sounds charming (5)

I believe the answer is:

suite

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'this set of rooms' is the definition.
(eg a hotel suite)

I don't understand how the rest of the clue works.

(Other definitions for suite that I've seen before include "Set of rooms; retinue" , "Train; set of rooms" , "Adjoining rooms" , "Musical composition" , "Set, e.g. of furniture" .)

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