Could the tattooist have them on people? (7)

I believe the answer is:

designs

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'people?' is the definition.
Although both the answer and definition are plural nouns, I can't understand how they can define each other.

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for designs that I've seen before include "Plots" , "Intentions" , "Plans" , "'Blueprints, patterns (7)'" , "intended purposes" .)

I've seen this clue in the Evening Standard.

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