Saying empty-headed swine spoil comeback (7)

I believe the answer is:

epigram

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'saying' is the definition.
(I know that epigram is a type of saying)

'empty-headed swine spoil comeback' is the wordplay.
'empty-headed' becomes 'e' (this could be a standard abbreviation of which I'm unaware).
'swine' becomes 'pig' (pig is a kind of swine).
'spoil' becomes 'mar' (synonyms).
'comeback' says the letters should be written in reverse.
'mar' written backwards gives 'ram'.
'e'+'pig'+'ram'='EPIGRAM'

Can you help me to learn more?

(Other definitions for epigram that I've seen before include "Pithy and witty saying" , "A short witty saying" , "Brief witticism" , "Brief witty saying" , "Sally perhaps" .)

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

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