See you welcoming one playing alone (7)

I believe the answer is:

soloing

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'see you welcoming one playing alone' is the definition.
I can't tell whether this defines the answer.

'see you welcoming one playing alone' is the wordplay.
'see you' becomes 'so long' (I've seen this before).
'welcoming' indicates putting letters inside (in sense of 'inviting in').
'one playing alone' becomes 'i' (I can't explain this - if you can you should give a lot more credence to this answer).
'solong' enclosing 'i' is 'SOLOING'.

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I've seen this clue in The Guardian.

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