Lip reader dismisses idler from the conference (4)

I believe the answer is:

pear

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'conference' is the definition.
(conference pear is a type of pear)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for pear that I've seen before include "Bartlett fruit" , "Orchard fruit" , "Fruit tree" , "Fruit (maybe Conference?)" , "William, maybe" .)

I've seen this clue in the Irish Times (Crosaire) and the Irish Times.

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