Functional; practical (6)

I believe the answer is:

useful

I believe this clue is a double definition.

'functional' is the first definition.
(similar in meaning)

'practical' is the second definition.
(similar in meaning)

(Other definitions for useful that I've seen before include "Handy, practical" , "Serviceable or functional" , "Practically helpful" , "Make yourself . . . . . . - help out" , "Expedient" .)

I've seen this clue in the Sydney Morning Herald.

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