Describing the shape of the vaults in the March edition (6)

I believe the answer is:

arched

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'describing the shape of the vaults' is the definition.
I can't judge whether this defines the answer.

'in the march edition' is the wordplay.
'in' indicates the answer is hidden within the clue.
'ARCHED' is hidden within 'march edition'.

Can you help me to learn more?

(Other definitions for arched that I've seen before include "like a viaduct?" , "Curved (over an opening)" , "Forming a curved span" , "bow" , "Bowed, curved" .)

I've seen this clue in The Irish News.

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