Crossword Genius

They're of marginal significance (5)

Ross

I believe the answer is:

edges

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'they're' is the definition.
The definition suggests an adverb but the answer is not.

'marginal significance' is the wordplay.
'marginal' becomes 'edge' (synonyms).
'significance' becomes 's' (this could be a standard abbreviation I've not previously seen).
'edge'+'s'='EDGES'

'of' is the link.

Can you help me to learn more?

(Other definitions for edges that I've seen before include "Outer limits" , "Borders, rims" , "They're farthest from the middle" , "Margins" , "Bounds" .)

I've seen this clue in the Evening Standard.
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