Shapes Tarantino's first Salinger adaptation (9)
I believe the answer is:
triangles
'shapes' is the definition.
(triangle is a kind of shape)
'tarantino's first salinger adaptation' is the wordplay.
'first' suggests taking the first letters.
'adaptation' is an anagram indicator.
The first letter of 'tarantino' is 't'.
'salinger' anagrammed gives 'riangles'.
't'+'riangles'='TRIANGLES'
(Other definitions for triangles that I've seen before include "Three-sided polygons" , "Percussion instruments" , "Geometrical figures" , "Three-sided figures" , "Musical instruments" .)