Shot for a good average (5)

I believe the answer is:

aimed

I'm a little stuck... Click here to teach me more about this clue!

'shot for' is the definition.
('aim' can be a synonym of 'shoot for')

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for aimed that I've seen before include "Tried; pointed" , "Focused on as target" , "Directed, targeted" , "Set sights on for a dime" , "Directed towards specified goal" .)

I've seen this clue in the Evening Standard.

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