Crossword Genius

Substantial clubs on Greek island (8)

Ross

I believe the answer is:

concrete

'substantial' is the definition.
(thesaurus)

'clubs on greek island' is the wordplay.
'clubs' becomes 'c' (abbreviation used in card games such as bridge).
'greek island' becomes 'crete' (Crete is a Greek island).
'c'+'on'+'crete'='CONCRETE'

(Other definitions for concrete that I've seen before include "Not abstract or imaginary" , "Substantial, real" , "Firm" , "It's composed of sand, cement and water" , "setter" .)

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