From long ago, famous ostrich I slaughtered (8)

I believe the answer is:

historic

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'from long ago famous' is the definition.
I can't tell whether this defines the answer.

'ostrich i slaughtered' is the wordplay.
'slaughtered' indicates an anagram.
'ostrich'+'i'='ostrichi'
'ostrichi' with letters rearranged gives 'HISTORIC'.

Can you help me to learn more?

(Other definitions for historic that I've seen before include "Of significance in the past" , "Choir sit (anag.)" , "Connecting with old times" , "Significant" , "Pertaining to what is important in the past" .)

I've seen this clue in The Guardian.

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