Crossword Genius

Leaves from Asia — temperature in that part of world has shifted (4)

Ross

I believe the answer is:

teas

I'm a little stuck... Click here to teach me more about this clue!

'leaves from asia' is the definition.
(tea leaves)

'temperature in that part of world has shifted' is the wordplay.
I cannot really understand how this works, but
'temperature' could be 't' (abbreviation) and 't' is found within the answer.
The remaining letters 'eas' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for teas that I've seen before include "Afternoon meals" , "Beverage made by steeping leaves in water" , "Beverages from leaves" , "Hot drinks" .)

I've seen this clue in The Guardian.
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