Weakness in floors? (5)

I believe the answer is:

flaws

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

This clue might be a double definition.

'weakness' is the first definition.
(I know this)

'floors?' is the second definition.
Although both the answer and definition are verbs in their -s form, I cannot understand how one could define the other.

'in' is the link.

Can you help me to learn more?

(Other definitions for flaws that I've seen before include "weaknesses" , "Defects" .)

I've seen this clue in the Evening Standard.

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