Design sofa on blackboard missing school recently (8)

I believe the answer is:

asoflate

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'recently' is the definition.
I know nothing about this answer so I cannot tell whether this works.

'design sofa on blackboard missing school' is the wordplay.
'design sofa on' becomes 'asof' (I can't explain this - if you can you should give a lot more credence to this answer).
'blackboard' becomes 'slate' (I've seen this in another clue).
'missing' is a deletion indicator.
'school' becomes 'S'.
'slate' with 's' removed is 'late'.
'asof'+'late'='ASOFLATE'

Can you help me to learn more?

I've seen this clue in The Irish Times.

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