Cook in train oil? (5)

I believe the answer is:

broil

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'cook' is the definition.
(I've seen this before)

'train oil?' is the wordplay.
'train' becomes 'br' (I can't explain this - if you can you should give a lot more credence to this answer).
'br'+'oil'='BROIL'

'in' acts as a link.

Can you help me to learn more?

(Other definitions for broil that I've seen before include "Be extremely hot" , "Old quarrel" , "disturbance" , "Maybe grill" , "stew" .)

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