Enlightening but no, not familiar, unfortunately (13)

I believe the answer is:

informational

'enlightening' is the definition.
(thesaurus)

'no not familiar unfortunately' is the wordplay.
'unfortunately' is an anagram indicator (a bad or unfortunate spelling).
'no'+'not'+'familiar'='nonotfamiliar'
'nonotfamiliar' with letters rearranged gives 'INFORMATIONAL'.

'but' acts as a link.

(Another definition for informational that I've seen is " Relating to knowledge or data".)

I've seen this clue in The Independent.

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