Crossword Genius

One's wearing simple pieces, time for dressing down? (12)

Ross

I believe the answer is:

chastisement

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

'down?' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'one's wearing simple pieces time for dressing' is the wordplay.
'one's' becomes 'is' (roman numeral).
'wearing simple' becomes 'chaste' (I've seen this before. I am not sure about the 'wearing' bit.).
'pieces' becomes 'men' (man can mean a chess piece).
'time for' becomes 't' (I've seen this in other clues).
'dressing' is an insertion indicator (a dressing is a kind of covering).
'chaste'+'men'+'t'='chastement'
'is' inserted into 'chastement' is 'CHASTISEMENT'.

Can you help me to learn more?

(Other definitions for chastisement that I've seen before include "Old fashioned discipline" , "Severe reprimand" , "Beating" .)

I've seen this clue in The Times.
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