Crossword Genius

Double support for return match? (6,3)

Ross

I believe the answer is:

second leg

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'double' is the definition.
I know nothing about this answer so I can't tell whether this works.

'support for return match?' is the wordplay.
'support' becomes 'second' (eg to second an idea is to support it).
'for' is a charade indicator (letters next to each other).
'return match?' becomes 'leg' (I can't explain this - if you can you should believe this answer much more).
'second'+'leg'='SECOND LEG'

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I've seen this clue in The Irish Times.
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