Crossword Genius

For a change, slip into slacks! (5)

Ross

I believe the answer is:

idles

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

'slacks' is the definition.
The definition and answer can be both to do with social activities as well as being verbs in their -s form.
Maybe there's an association between them I don't understand?

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for idles that I've seen before include "Of engine, just ticks over in neutral" , "Avoids working" , "Lazes about, just ticks over" , "Wastes time" , "Does little, just ticks over" .)

I've seen this clue in the Evening Standard.
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