You need to dress for it (7)

I believe the answer is:

decency

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'it' is the definition.
The definition suggests a singular noun which matches the answer.

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(Other definitions for decency that I've seen before include "proper behaviour" , "Propriety" , "Seemliness" , "Acceptable behaviour" , "It's the right thing to do" .)

I've seen this clue in the Evening Standard.

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