Springs broken by saps (4)

I believe the answer is:

spas

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

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

'broken by saps' is the wordplay.
'saps' can be anagrammed to 'SPAS'.
However, I am not clear how this is indicated.

Can you help me to learn more?

(Other definitions for spas that I've seen before include "Mineral springs" , "Bath and suchlike" , "Health resorts near springs" .)

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