Large, extremely hot section of Australia's coastline (5)
I believe the answer is:
bight
'section of australia's coastline' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe you can see an association between them that I don't see?
'large extremely hot' is the wordplay.
'large' becomes 'big' ('big' can be a synonym of 'large').
'extremely' suggests removing the centre.
'hot' with its centre removed is 'ht'.
'big'+'ht'='BIGHT'
Can you help me to learn more?
(Other definitions for bight that I've seen before include "Bay - bend in rope" , "bend in river" , "Bay, sounds like a morsel of food" , "Large broad bay -- middle part of a slack rope" , "Coastline curve forming a bay" .)