Crossword Genius

Small border of growth (5)

Ross

I believe the answer is:

sedge

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'growth' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'small border' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'border' becomes 'edge' (synonyms).
's'+'edge'='SEDGE'

'of' acts as a link.

Can you help me to learn more?

(Other definitions for sedge that I've seen before include "Coarse, grasslike plant" , "Plant growing in swampy ground" , "Bog plant; type of warbler" , "Plant like grass" , "Grass-like plant growing in wet places" .)

I've seen this clue in The Mirror.
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