What’s used to build clubs on Mediterranean island (8)
I believe the answer is:
concrete
'what's used to' is the definition.
I can't judge whether this defines the answer.
'clubs on mediterranean island' is the wordplay.
'clubs' becomes 'c' (abbreviation used in card games such as bridge).
'mediterranean island' becomes 'Crete' (Greek island).
'c'+'on'+'crete'='CONCRETE'
'build' acts as a link.
Can you help me to learn more?
(Other definitions for concrete that I've seen before include "Actual - stuff made with cement" , "Specific; definite" , "Building material is not abstract" , "Solid, real" , "Definite; building material" .)