Crossword Genius

Medicine's supposed to suppress frigidity (7)

Ross

I believe the answer is:

iciness

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

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

'medicine's supposed to suppress' is the wordplay.
'ICINESS' is hidden within the letters.
But, I am unsure how this is indicated.

Can you help me to learn more?

(Other definitions for iciness that I've seen before include "Hostility, unfriendliness" , "Frigidity" , "Extreme hostility" , "unfriendly manner" , "Extreme cold" .)

I've seen this clue in The Everyman puzzle in The Observer.
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