Murdoch in library vocal assistant erected (4)

I believe the answer is:

iris

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'murdoch' is the definition.
(author Iris Murdoch)

I can't explain the rest of the clue.

(Other definitions for iris that I've seen before include "In the middle of which pupil is opening" , "bloomer?" , "Female" , "is 21[WOMAN], perhaps" , "Rainbow-goddess" .)

I've seen this clue in the Sydney Morning Herald.

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