Obligatory (9)

I think it could be either:

Which length description are you looking for?:

mandatory

'obligatory' is the definition.
(similar in meaning)

This is the entire clue.

(Other definitions for mandatory that I've seen before include "required" , "Not optional" , "Binding" , "Compulsory" , "Obligatory" .)

I've seen this clue in The Mirror, The Telegraph and the Evening Standard.

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