Hairy it may be, but you have it at your fingertips! (7)

I believe the answer is:

keratin

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'it at your fingertips' is the definition.
The definition suggests a singular noun which matches the answer.

I cannot understand how the rest of the clue works.

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(Other definitions for keratin that I've seen before include "Material in hooves and nails" , "Constituent of hair/nails" , "Rate ink (anag) - fibrous protein" , "Hair, nails substance" , "Protein found in hair and nails" .)

I've seen this clue in the Evening Standard.

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