Utterly stuns because gets round labyrinth (6)
I believe the answer is:
amazes
'utterly stuns' is the definition.
'amazes' can be an answer for 'stuns' (I've seen this before). I'm not sure about the 'utterly' bit.
'because gets round labyrinth' is the wordplay.
'because' becomes 'as' (I've seen this in other clues).
'gets round' is an insertion indicator.
'labyrinth' becomes 'maze' (synonyms).
'as' placed around 'maze' is 'AMAZES'.
Can you help me to learn more?
(Another definition for amazes that I've seen is " Stuns".)