Very soft mini-soap is squishy (10)

I believe the answer is:

pianissimo

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

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

'mini-soap is squishy' is the wordplay.
'mini-soap is' can be anagrammed to 'PIANISSIMO'.
But, I am unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for pianissimo that I've seen before include "Very quietly (music)" , "Very softly" , "Very quiet" , "Very soft (music)" , "(To be played) very quietly" .)

I've seen this clue in The Times.

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