Familiar name of a coalfield (5)

I believe the answer is:

alfie

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

'familiar name' is the definition.
'Alfie' can be an answer for 'name'. I'm not sure about the 'familiar' bit.

'of a coalfield' is the wordplay.
'of' indicates the answer is hidden within the clue.
'ALFIE' can be found hidden inside 'coalfield'.

Can you help me to learn more?

(Other definitions for alfie that I've seen before include "Nineteen sixty six Michael Caine film" , "1966 Michael Caine film" , "Michael Caine role reprised by Jude Law" , "Boy" , "well-known film" .)

I've seen this clue in the Evening Standard.

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