Crossword Genius

Satisfy that teas have improved (4)

Ross

I believe the answer is:

sate

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

'satisfy' is the definition.
(I've seen this before)

'teas have improved' is the wordplay.
'teas' anagrams to 'SATE'.
However, I am not sure how the anagram is indicated.

'that' acts as a link.

Can you help me to learn more?

(Other definitions for sate that I've seen before include "Supply to full capacity" , "Fill to repletion" , "cloy" , "Overfill, gorge" , "Fill completely" .)

I've seen this clue in The Mirror.
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