A labyrinth that will astonish (5)

I believe the answer is:

amaze

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'astonish' is the definition.
(I know that astonish can be written as amaze)

'a labyrinth' is the wordplay.
'labyrinth' becomes 'maze' (synonyms).
'a'+'maze'='AMAZE'

'that will' acts as a link.
This may not be correct. Some or all of it may belong to another bit of the clue.

Can you help me to learn more?

(Other definitions for amaze that I've seen before include "Flummox" , "Bowl over" , "Surprise greatly, astonish" , "Stagger" , "wow!" .)

I've seen this clue in The Irish Independent.

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