Chap occupies excellent day going round island (8)

I believe the answer is:

tasmania

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'round island' is the definition.
'tasmania' can be an answer for 'island' (Tasmania is an example). I am not sure about the 'round' bit.

'chap occupies excellent day going' is the wordplay.
'chap' becomes 'man' (chap can mean a man).
'occupies' is an insertion indicator (inserted letters occupy or enter the word).
'excellent day going' becomes 'tasia' (I am not sure about this - if you are sure you should believe this answer much more).
'man' inserted into 'tasia' is 'TASMANIA'.

Can you help me to learn more?

(Other definitions for tasmania that I've seen before include "Pacific isle" , "somewhere in Antipodes?" , "Aussie island state" , "Van Diemen's Land" , "Antipodean island state" .)

I've seen this clue in The Telegraph.

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