Irresistible urge (7)

I believe the answer is:

impulse

(Other definitions for impulse that I've seen before include "Impel us with sudden urge" , "Sudden or instinctive desire" , "Impetus - whim" , "A sudden inclination to act (7)" , "A sudden urge or whim" .)

I've seen this clue in The Mirror.

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