An eagle perhaps you might catch devouring small cuckoo (6)

I believe the answer is:

absurd

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'cuckoo' is the definition.
(cuckoo -> absurd)

I cannot understand how the rest of the clue works.

(Other definitions for absurd that I've seen before include "Quite ridiculous, laughable" , "irrational" , "'Derisory, cockeyed (6)'" , "10 18's [SAMUAL BECKETT] style of theatre" , "Foolish, quite ridiculous" .)

I've seen this clue in The Times.

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