Appears to be a rotunda when one views it (5,5)

I believe the answer is:

looks round

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'a rotunda when one views it' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'appears to' is the wordplay.
'appears' becomes 'looks' ('look' can be a synonym of 'appear').
'to' becomes 'round' (I can't explain this - if you can you should believe this answer much more).
'looks'+'round'='LOOKS ROUND'

'be' acts as a link.

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