Crossword Genius

Extra for packet? More than enough soup without seconds (6,7)

Ross

I believe the answer is:

excess postage

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

'enough soup without seconds' is the definition.
I can't tell whether this definition defines the answer.

'extra for packet? more' is the wordplay.
'extra' becomes 'excess' (synonyms).
'for' is a charade indicator (letters next to each other).
'packet? more' becomes 'postage' (I am not sure about this - if you are sure you should believe this answer much more).
'excess'+'postage'='EXCESS POSTAGE'

'than' acts as a link.

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I've seen this clue in The Times.
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