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Flow
of
vapour
engulfing
opening
of
railway
(6)
Flow of vapour engulfing opening of railway (6)
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The definition is at the beginning of the clue.
How the clue works
See Flow sitting there as the definition, meaning a stream of water. Then take STEAM (that's your vapour) and slot in R, the opening letter of railway, right into the middle to get ST-R-EAM.