Crossword Genius

Thus, a quiet detergent (4)

Ross

I believe the answer is:

soap

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

'thus a quiet' is the wordplay.
'thus' becomes 'so' (synonyms).
'quiet' becomes 'p' (music symbol for 'piano', ie soft or quiet).
'so'+'a'+'p'='SOAP'

(Other definitions for soap that I've seen before include "TV programme - sudsy bar" , "If soft, it's used to flatter" , "TV programme; cleanser" , "Sudsy TV show?" , "TV entertainment" .)

I've seen this clue in The Mirror.
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