Sun did move around bottle, keen as ever (13)

I believe the answer is:

undiscouraged

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'keen as ever' is the definition.
I can't judge whether this definition defines the answer.

'sun did move around bottle' is the wordplay.
'move' indicates an anagram.
'around' indicates putting letters inside.
'bottle' becomes 'courage' (I've seen this before).
'sun'+'did'='sundid'
'sundid' with letters rearranged gives 'undisd'.
'undisd' enclosing 'courage' is 'UNDISCOURAGED'.

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I've seen this clue in The Daily Express.

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