Shapes of twisted lager tins (9)
I believe the answer is:
triangles
'shapes' is the definition.
(triangle is a kind of shape)
'twisted lager tins' is the wordplay.
'twisted' indicates an anagram.
'lager'+'tins'='lagertins'
'lagertins' with letters rearranged gives 'TRIANGLES'.
'of' acts as a link.
(Other definitions for triangles that I've seen before include "Three-sided polygons" , "Musical instruments" , "Three-sided shapes" , "Percussion instruments" , "Geometrical figures" .)