Happy, optimistic (6)

I think it could be either:

Which length description are you looking for?:

cheery

I believe this is a double definition.

'happy' is the first definition.
(I've seen this before)

'optimistic' is the second definition.
(I've seen this in another clue)

(Other definitions for cheery that I've seen before include "Merry, jovial" , "Happy, optimistic" , "In good spirits" , "Bright - pleasant - good-humoured" , "Joyful -- optimistic" .)

I've seen this clue in The Times.

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