Crossword Genius

Principal structure (4)

Ross

I believe the answer is:

arch

This clue is a double definition.

'principal' is the first definition.
(as in arch-enemy)

'structure' is the second definition.
(arch is a kind of structure)

(Other definitions for arch that I've seen before include "Curved vault" , "Playfully superior" , "Teasing; part of foot" , "Curvature" , "Way though - on foot!" .)

I've seen this clue in The Irish Independent and The Telegraph.
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