Shape of crate Glen damaged (9)
I believe the answer is:
rectangle
'shape' is the definition.
(rectangle is a kind of shape)
'of crate glen damaged' is the wordplay.
'of' is an anagram indicator (the answer comes from or 'of' the letters).
'damaged' is an anagram indicator.
'crate' with letters rearranged gives 'recta'.
'glen' anagrammed gives 'ngle'.
'recta'+'ngle'='RECTANGLE'
(Other definitions for rectangle that I've seen before include "Four-sided figure" , "regular sort of figure" , "Oblong" , "Four sides involved in this" , "Shape of football pitch" .)