Focus on procedure regularly aiming for improved accuracy (6,8)
I believe the answer is:
target practice
'regularly aiming for improved accuracy' is the definition.
I can't tell whether this definition defines the answer.
'focus on procedure' is the wordplay.
'focus on' becomes 'target' (I am not sure about this - if you are sure you should believe this answer much more).
'procedure' becomes 'practice' (I have seen 'Customary procedure ' mean 'practice' so perhaps 'procedure' could also mean 'practice').
'target'+'practice'='TARGET PRACTICE'
Can you help me to learn more?
(Other definitions for target practice that I've seen before include "Learner's shooting session" , "aiming to improve with this?" , "Working on aim" .)