Crossword Genius

Sharing cost of portion alfresco? (7,3)

Ross

I believe the answer is:

helping out

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

'portion alfresco?' is the wordplay.
'portion' becomes 'helping' (synonyms).
'alfresco?' becomes 'out' (an alfresco meal is eaten outside).
'helping'+'out'='HELPING OUT'

'of' acts as a link.

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I've seen this clue in The Independent.
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