WI lecher (anag.) - short poem about a famous person (8)

I believe the answer is:

clerihew

(Other definitions for clerihew that I've seen before include "Bentley's jingle" , "Funny lines" , "Short comic verse form" , "Humorous verse form" , "Satire of rhymed couplets about a famous person" .)

I've seen this clue in The Guardian.

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