More irritated tackling constant goal getter (6)
I believe the answer is:
scorer
'goal getter' is the definition.
(I've seen this in another clue)
'more irritated tackling constant' is the wordplay.
'more irritated' becomes 'sorer' (I've seen this in another clue).
'tackling' means one lot of letters goes inside another (to tackle is to take possession of).
'constant' becomes 'c' (common symbol in maths for an unknown constant).
'sorer' placed around 'c' is 'SCORER'.
(Other definitions for scorer that I've seen before include "One gaining points" , "Person totting up the points" , "Cricket statistician" , "Cricket official" , "One getting a goal" .)