And, finally, Vienna roll comes round (4)
I believe the answer is:
also
'and' is the definition.
'finally vienna roll comes round' is the wordplay.
'finally' indicates one should take the final letters.
'round' becomes 'o' (round can mean a round object).
The last letters of 'vienna roll comes' are 'als'.
'als'+'o'='ALSO'
(Other definitions for also that I've seen before include "Item" , "To boot" , "As well, in addition" , "Likewise" , "an indication of more to come" .)