Ivy is one always on the go (9)

I believe the answer is:

evergreen

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

'one always on the go' is the wordplay.
'one always' becomes 'ever' (I've seen this in another clue).
'on the go' becomes 'green' (I can't explain this - if you can you should believe this answer much more).
'ever'+'green'='EVERGREEN'

'is' acts as a link.

Can you help me to learn more?

(Other definitions for evergreen that I've seen before include "Leaves of holly and ivy are --" , "Having enduring popularity" , "Continually fresh" , "Like Laurel" , "Enduringly fresh" .)

I've seen this clue in The Globe and Mail.

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