Silly carpenter, having used the other end for nailing attic, aiming drill (6,8)

I believe the answer is:

target practice

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'drill' is the definition.
(target practice is a kind of drill)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for target practice that I've seen before include "Working on aim" , "Learner's shooting session" , "aiming to improve with this?" .)

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