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Hair and why it's gone frizzy? (5)

Ross

I believe the answer is:

shock

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'hair' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for shock that I've seen before include "Outrageous" , "See 18" , "Unpleasant surprise" , "Sudden upset; offend" , "Trauma" .)

I've seen this clue in The Sun.
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