Crossword Genius

Sediment found by the Mexican common weed (9)

Ross

I believe the answer is:

groundsel

'common weed' is the definition.
(I've seen this before)

'sediment found by the mexican' is the wordplay.
'sediment' becomes 'grounds' (as in coffee grounds).
'found by' is a charade indicator (letters next to each other).
'the mexican' becomes 'el' ('the' in Spanish).
'grounds'+'el'='GROUNDSEL'

(Other definitions for groundsel that I've seen before include "Common weed" , "Plant of daisy family" , "feed to the birds" , "plant, unwanted?" .)

I've seen this clue in The Guardian.
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