Aim in good teaching (8)

I believe the answer is:

training

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'teaching' is the definition.
(training is a kind of teaching)

'aim in good' is the wordplay.
'aim' becomes 'train' ('train' can be a synonym of 'aim').
'in good' becomes 'ing' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'train'+'ing'='TRAINING'

Can you help me to learn more?

(Other definitions for training that I've seen before include "Process of instruction" , "Working out" , "Preparing for competition or career" , "Regime" , "Doing exercise" .)

I've seen this clue in The Independent.

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