Train about ... about ... about to proceed once more (10)

I believe the answer is:

recontinue

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'proceed once more' is the definition.
('continue' can be a synonym for 'proceed' so perhaps 'recontinue' is OK for 'proceed once more')

'train about about about' is the wordplay.
'train about' becomes 'continue' (I can't explain this - if you can you should believe this answer much more).
'about' means one lot of letters go next to another.
'about' becomes 're' (regarding).
'continue' put after 're' is 'RECONTINUE'.

'to' acts as a link.

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I've seen this clue in The Independent.

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