Work endlessly with excessive enthusiasm in part of Australia (8)
I believe the answer is:
tasmania
'part of australia' is the definition.
(I know that Australia is the is part of of Tasmania.)
'work endlessly with excessive enthusiasm' is the wordplay.
'work endlessly' becomes 'tas' (I can't explain this - if you can you should believe this answer much more).
'with' means one lot of letters go next to another.
'excessive enthusiasm' becomes 'mania' (I've seen this before).
'tas'+'mania'='TASMANIA'
'in' is the link.
Can you help me to learn more?
(Other definitions for tasmania that I've seen before include "State off 23 [VICTORIA]" , "Australian island to south of Bass Strait" , "somewhere in Antipodes?" , "Van Diemen's Land" , "Commonwealth state" .)