Such prosperous days, my pal made possible (5)

I believe the answer is:

palmy

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

'such prosperous' is the definition.
'palmy' can be an answer for 'prosperous' (synonyms). I'm not certain of the 'such' bit.

'days my pal made possible' is the wordplay.
'my pal' can be anagrammed to 'PALMY'.
But, I'm unsure how this is indicated.

Can you help me to learn more?

(Other definitions for palmy that I've seen before include "Flourishing like tropical tree" , "Comfortable and prosperous (days)" .)

I've seen this clue in the Evening Standard.

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