Perhaps Murdoch's integral to Blairism? (4)

I believe the answer is:

iris

I'm a little stuck... Click here to teach me more about this clue!

'perhaps murdoch's' is the definition.
(Iris Murdoch)

'integral to blairism?' is the wordplay.
'IRIS' is hidden within the letters.
But, I'm unsure how this is indicated.

Can you help me to learn more?

(Other definitions for iris that I've seen before include "Camera diaphragm" , "pupil's governor" , "may open up in camera" , "Fleur-de-lis" , "Lily" .)

I've seen this clue in The Everyman puzzle in The Observer.

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