Crossword Genius

When collections are worth having (6)

Ross

I believe the answer is:

assets

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

'worth having' is the definition.
I can't judge whether this definition defines the answer.

'when collections' is the wordplay.
'when' becomes 'as' (eg 'when I walked' means 'as I walked').
'collections' becomes 'sets' (set is a kind of collection).
'as'+'sets'='ASSETS'

'are' acts as a link.

Can you help me to learn more?

(Other definitions for assets that I've seen before include "Useful or valuable things" , "Valuable resources" , "One's total goods" , "Properties that have money value" , "Stance discouraging particular action" .)

I've seen this clue in The Telegraph, The Globe and Mail and The Guardian.
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