Is the rest of the head straight in this bunch? (7)

I believe the answer is:

nosegay

'this bunch?' is the definition.
(a nosegay is a bunch of flowers)

I don't understand how the remainder of the clue works.

(Other definitions for nosegay that I've seen before include "Fragrant posy" , "Small posy" , "bunch of pansies?" , "Old-fashioned posy" , "Flower arrangement" .)

I've seen this clue in The Guardian.

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