Cast entertaining unknown new clubs in timely agreement? (7)

I believe the answer is:

synched

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'cast entertaining unknown new clubs in timely agreement?' is the definition.
I can't judge whether this defines the answer.

'cast entertaining unknown new clubs' is the wordplay.
'cast' becomes 'shed' (shedding is a kind of casting).
'entertaining' is an insertion indicator (inviting in, as for dinner).
'unknown' becomes 'y' (algebra).
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'clubs' becomes 'c' (abbreviation used in card games such as bridge).
'y'+'n'+'c'='ync'
'shed' placed around 'ync' is 'SYNCHED'.

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I've seen this clue in The Times.

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