Crossword Genius

Delightful day for Kitty (4)

Ross

I believe the answer is:

fund

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'for kitty' is the definition.
(fund or money for a particular purpose)

'delightful day' is the wordplay.
'delightful' becomes 'fun' (I can't explain this - if you can you should give a lot more credence to this answer).
'day' becomes 'd' (abbreviation for day).
'fun'+'d'='FUND'

Can you help me to learn more?

(Other definitions for fund that I've seen before include "Pay for; kitty" , "Pool of money" , "Give money" , "Monetary resources" , "Cash reserve" .)

I've seen this clue in The Telegraph.
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