It has a flat face with a certain amount of hair on (4)

I believe the answer is:

iron

I'm a little stuck... Click here to teach me more about this clue!

'it has a flat face with a certain amount' is the definition.
The definition suggests a singular noun which matches the answer.

'hair on' is the wordplay.
'IRON' is hidden in amongst the letters.
However, I am uncertain how the hidden word is indicated.

'of' acts as a link.

Can you help me to learn more?

(Other definitions for iron that I've seen before include "Flatten; element" , "Main part of steel" , "Smoother - metal" , "Former dividing line across Europe" , "Main component of steel" .)

I've seen this clue in the Evening Standard.

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