Saki penned satire, ultimately a source of inspiration (4)

I believe the answer is:

idea

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'source of inspiration' is the definition.
'idea' can be an answer for 'inspiration' (I've seen this in another clue). I'm not certain of the 'source of' bit.

'saki penned satire ultimately a' is the wordplay.
'ultimately' suggests the final letters.
The last letters of 'saki penned satire' are 'ide'.
'ide'+'a'='IDEA'

Can you help me to learn more?

(Other definitions for idea that I've seen before include "Flash of inspiration?" , "Purpose" , "Thought or notion (4)" , "Suggestion" , "Intention" .)

I've seen this clue in The Independent.

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