Always fresh in box, perhaps (9)

I believe the answer is:

evergreen

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'always fresh in box perhaps' is the definition.
I know that 'fresh' relates to this answer.

'always fresh' is the wordplay.
'always' becomes 'ever' (synonyms).
'fresh' becomes 'green' (I've seen this before).
'ever'+'green'='EVERGREEN'

Can you help me to learn more?

(Other definitions for evergreen that I've seen before include "Timeless" , "Plant with leaves all year round" , "Laurel for one" , "having no garden shed?" , "always retaining popularity" .)

I've seen this clue in The Telegraph.

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