Crossword Genius

Act perfectly to do Age puzzles, cracking quickie written by Liberal? (3,1,4,7)

Ross

I believe the answer is:

set a good example

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

'act perfectly' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'do age puzzles cracking quickie written by liberal?' is the wordplay.
I cannot quite understand how this works, but
'do' could be 'set' (synonyms) and 'set' is located in the answer.
'cracking' could be 'good' (similar in meaning) and 'good' is found in the answer.
'by' could be 'x' (multiplication sign) and 'x' is found in the answer.
'liberal?' could be 'ample' (I've seen this in other clues) and 'ample' is found within the answer.
The remaining letters 'ae' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

'to' is the link.

Can you help me to learn more?

(Other definitions for set a good example that I've seen before include "Be a role model" , "inspire others?" .)

I've seen this clue in the Sydney Morning Herald.
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