Friendly about song contest but abandoning EU for now (13)

I believe the answer is:

provisionally

I'm a little stuck... Click here to teach me more about this clue!

'for now' is the definition.
(synonyms)

'friendly about song contest but abandoning eu' is the wordplay.
I cannot quite understand how this works, but
'about' could be 'on' (as in a book 'on' a certain topic) and 'on' is found within the answer.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Times.

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