Crossword Genius

Good man maps out marks of approval (6)

Ross

I believe the answer is:

stamps

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

'marks of approval' is the definition.
The answer and definition can be both related to communication as well as being plural nouns.
Perhaps there's an association between them I don't understand?

'good man maps out' is the wordplay.
'good man' becomes 'st' (abbreviation for saint).
'out' indicates an anagram (out can mean wrong or inaccurate).
'maps' anagrammed gives 'amps'.
'st'+'amps'='STAMPS'

Can you help me to learn more?

(Other definitions for stamps that I've seen before include "Tramples" , "Philatelists study them" , "Puts the foot down on letters" , "Postal tokens" , "Philatelists collect them" .)

I've seen this clue in The Globe and Mail.
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