Crossword Genius

Round item a stone in coarse aggregate (7)

Ross

I believe the answer is:

ballast

'coarse aggregate' is the definition.
(coarse material used in concrete)

'round item a stone' is the wordplay.
'round item' becomes 'ball' (balls are round).
'stone' becomes 'st'.
'ball'+'a'+'st'='BALLAST'

'in' acts as a link.

(Other definitions for ballast that I've seen before include "Stabilising material" , "Heavy stuff used to stabilise boat" , "Heavy material giving ship stability" , "Mass giving ship stability" , "Weight to stabilise a ship" .)

I've seen this clue in The Telegraph and The Sun.
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