Graphic representation of a grim cop angrily grabbing shirt (9)
I believe the answer is:
pictogram
'graphic representation' is the definition.
(I've seen this before)
'a grim cop angrily grabbing shirt' is the wordplay.
'angrily' is an anagram indicator (I've seen this in other clues).
'grabbing' indicates putting letters inside.
'shirt' becomes 't' (as in a T-shirt).
'a'+'grim'+'cop'='agrimcop'
'agrimcop' anagrammed gives 'picogram'.
'picogram' enclosing 't' is 'PICTOGRAM'.
'of' is the link.
(Other definitions for pictogram that I've seen before include "Graphic representation" , "Drawn symbol representing a word/phrase" .)