Ring the film centre for hair-dressing (3)

I believe the answer is:

oil

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'hair-dressing' is the definition.
I can't judge whether this definition defines the answer.

'ring the film centre' is the wordplay.
'ring' becomes 'O' (O is the shape of a ring).
'centre' indicates the central letters.
The central letters of 'film' are 'il'.
'o'+'il'='OIL'

'for' is the link.

Can you help me to learn more?

(Other definitions for oil that I've seen before include "Viscous substance as lubricant" , "Valuable viscous liquid" , "Thick liquid that doesn't dissolve in water" , "Slippery liquid" , "painting" .)

I've seen this clue in the Evening Standard.

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