Crossword Genius

Marched round gateway (4)

Ross

I believe the answer is:

arch

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

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

'marched round' is the wordplay.
'ARCH' is hidden in amongst the letters.
However, I am uncertain how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for arch that I've seen before include "Char the curved structure" , "Curved bony structure in the foot" , "Curvature" , "Chief; bow" , "Curved span" .)

I've seen this clue in The Mirror.
Want a hint initially instead of a full solution? Install my app