Gratis (13)

I think it could be either:

Which length description are you looking for?:

complimentary

'gratis' is the definition.
(synonyms)

This is all the clue.

(Other definitions for complimentary that I've seen before include "Given free" , "Flattering" , "Free (ticket); praising" , "Expressing approval - not to be paid for" , "Clammy pointer (anag) - costing nothing" .)

I've seen this clue in The Telegraph.

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