Treatment of the dog I mean to agitate about (8)
I believe the answer is:
manicure
'treatment' is the definition.
(nail treatment)
'dog i mean to agitate about' is the wordplay.
'dog' becomes 'cur' (a cur is an aggressive or scruffy dog).
'to agitate' indicates an anagram (I've seen 'agitating' mean this).
'about' indicates putting letters inside.
'i'+'mean'='imean'
'imean' is an anagram of 'manie'.
'cur' put into 'manie' is 'MANICURE'.
'of the' acts as a link.
(Other definitions for manicure that I've seen before include "Cosmetic nail treatment" , "Care of hands and nails" , "A numeric approach to care of the hands" , "Cosmetic treatment for the hands" , "Care of hands and fingernails" .)