Gasp, astonished to find concealed springs (4)

I believe the answer is:

spas

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'concealed springs' is the definition.
'spas' can be an answer for 'springs' (I've seen this before). I am not certain of the 'concealed' bit.

'gasp astonished to find' is the wordplay.
'to find' says the answer is hidden in the clue (I've seen 'found' mean this).
'SPAS' is hidden in the letters of 'gasp astonished'.

Can you help me to learn more?

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

I've seen this clue in The Irish Times.

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