Crossword Genius

Source of fuel boy used in chilly conditions (9)

Ross

I believe the answer is:

coalfield

'source of fuel' is the definition.
(source of coal)

'boy used in chilly conditions' is the wordplay.
'boy' becomes 'Alfie' (boy's name).
'used in' means one lot of letters goes inside another.
'chilly conditions' becomes 'cold' (cold conditions).
'alfie' going inside 'cold' is 'COALFIELD'.

(Another definition for coalfield that I've seen is " place of mine".)

I've seen this clue in The Times.
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