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Baby's gear would be smart on Sunday (5)

Ross

I believe the answer is:

nappy

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

This clue could be a double definition.

'baby's gear' is the first definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'smart on sunday' is the second definition.
Both the answer and definition are adjectives. Perhaps there's a link between them I don't understand?

'would be' acts as a link.

Can you help me to learn more?

(Other definitions for nappy that I've seen before include "Item for baby" , "Baby garment" , "Baby's garment" , "Baseball fielder" , "One pinned on baby" .)

I've seen this clue in The Sun.
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