Taxi back in Australia: count on that (6)
I believe the answer is:
abacus
'taxi back in australia count on that' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe there's an association between them I don't understand?
'taxi back in australia' is the wordplay.
'taxi' becomes 'cab' (synonyms).
'back' says the letters should be written backwards.
'in' indicates putting letters inside.
'australia' becomes 'Aus' (abbreviation).
'cab' backwards is 'bac'.
'bac' put into 'aus' is 'ABACUS'.
Can you help me to learn more?
(Other definitions for abacus that I've seen before include "Totter" , "Very early calculator" , "Manual calculator" , "Old calculator" , "Early counting-frame" .)