A labyrinth's floor (5)

I believe the answer is:

amaze

'floor' is the definition.
(I've seen this before)

'a labyrinth's' is the wordplay.
'labyrinth' becomes 'maze' ('maze' can be a synonym of 'labyrinth').
'a'+'maze'='AMAZE'

(Other definitions for amaze that I've seen before include "wow!" , "Greatly surprise, fill with wonder" , "Bewilder" , "Stagger" , "Greatly surprise in a labyrinth" .)

I've seen this clue in The Telegraph.

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