They might perk up (4)

I believe the answer is:

ears

(Other definitions for ears that I've seen before include "Listening organs" , "Shakespeare 'Friends, Romans, countrymen, lend me your . . . .'" , "Seed-bearing parts of corn" , "Locations for buds or studs?" , "Sear (anag.)" .)

I've seen this clue in the Universal.

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