Band essential to salsa shows (4)

I believe the answer is:

sash

'band' is the definition.
(a band of material)

'essential to salsa shows' is the wordplay.
'essential to' indicates a hidden word (I've seen this in other clues).
'SASH' is hidden within 'salsa shows'.

(Other definitions for sash that I've seen before include "Piece of cloth round waist or shoulder" , "Baldrick" , "Band - scarf" , "Girdle" , "Band worn over shoulder or round waist" .)

I've seen this clue in The Everyman puzzle in The Observer.

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