Crossword Genius

Small border for growth in wet ground (5)

Ross

I believe the answer is:

sedge

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

'growth in wet ground' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

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

'for' is the link.

Can you help me to learn more?

(Other definitions for sedge that I've seen before include "Grass-like plant growing in marshes" , "Marsh-dweller" , "Coarse grassy plant" , "Plant like grass" , "Marsh grass" .)

I've seen this clue in The Independent.
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