Crossword Genius

Second border, it's like grass (5)

Ross

I believe the answer is:

sedge

'it's like grass' is the definition.
(grasslike plant)

'second border' is the wordplay.
'second' becomes 's' (common abbreviation).
'border' becomes 'edge' (synonyms).
's'+'edge'='SEDGE'

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

I've seen this clue in The Mirror.
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