Without bells and whistles (5)

I think it could be either:

Which length description are you looking for?:

plain

'without bells and whistles' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for plain that I've seen before include "Clear, candid" , "Unadorned on flat area" , "no oil painting features" , "Unflavoured" , "Flat land; unmarked" .)

I've seen this clue in The Guardian, the Universal and the USA Today.

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