Inborn pattern of behaviour (8)

I believe the answer is:

instinct

'inborn pattern of behaviour' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for instinct that I've seen before include "Natural response" , "Ability" , "Natural inclination" , "Inborn pattern of behaviour" , "Thoughtless impulse" .)

I've seen this clue in The Irish Times.

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