Irascible type's gone out after seeing dog dirt (10)
I believe the answer is:
curmudgeon
'irascible type's' is the definition.
(a curmudgeon is a grumpy person)
'gone out after seeing dog dirt' is the wordplay.
'out' is an anagram indicator (out can mean wrong or inaccurate).
'after' means one lot of letters go next to another.
'seeing dog' becomes 'cur' (cur is a kind of dog).
'dirt' becomes 'mud' (mud is a kind of dirt).
'gone' with letters rearranged gives 'geon'.
'cur'+'mud'='curmud'
'geon' put after 'curmud' is 'CURMUDGEON'.
(Other definitions for curmudgeon that I've seen before include "Bad-tempered person" , "Cranky oldster" , "He's surly" , "Surly miser" , "grump" .)