Angry for the most part being grabbed by a jerk? That's puzzling! (8)
I believe the answer is:
acrostic
'that's puzzling' is the definition.
I can't tell whether this defines the answer.
'angry for the most part being grabbed by a jerk?' is the wordplay.
'angry' becomes 'cross' (I've seen this before).
'for the most part' means to remove the last letter.
'being grabbed by' is an insertion indicator.
'jerk?' becomes 'tic' (I've seen this in other clues).
'cross' with its last letter taken off is 'cros'.
'a'+'tic'='atic'
'cros' put into 'atic' is 'ACROSTIC'.
Can you help me to learn more?
(Other definitions for acrostic that I've seen before include "Bit of wordplay" , "Puzzle involving leading characters" , "Initial letter puzzle" , "Puzzle involving a hidden message" , "Socratic sort of word puzzle" .)