Crossword Genius

Keep going after support with just one behind (6,4)

Ross

I believe the answer is:

second last

'with just one behind' is the definition.
(one before the last)

'keep going after support' is the wordplay.
'keep going' becomes 'last' (I've seen this before).
'after' is a charade indicator (letters next to each other).
'support' becomes 'second' (eg to second an idea is to support it).
'last' put after 'second' is 'SECOND LAST'.

I've seen this clue in The Guardian.
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