Hairstyling aid (7,5)

I think it could be either:

Which length description are you looking for?:

7,5

gel

(Other definitions for gel that I've seen before include "Solidify" , "Posh female" , "Hair treatment" , "Hair-dressing preparation" , "shock treatment" .)

I've seen this clue in The Sun, the King Feature Syndicate and the Penny Press.

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