What one must do after disastrous event, is collect the artworks (15)

I believe the answer is:

pickupthepieces

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'what one must do after disastrous event' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'is collect the artworks' is the wordplay.
'is collect' becomes 'pickup' (I've seen this before).
'artworks' becomes 'pieces' (I can't explain this - if you can you should believe this answer much more).
'pickup'+'the'+'pieces'='PICKUPTHEPIECES'

Can you help me to learn more?

I've seen this clue in The Irish Times.

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