Indicate imminent arrival of wine butt (7)

I believe the answer is:

portend

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'indicate imminent arrival' is the definition.
'portend' can be an answer for 'indicate' (portending is a kind of indicating). I am not sure about the 'imminent arrival' bit.

'wine butt' is the wordplay.
'wine' becomes 'port' (port is a kind of wine).
'butt' becomes 'end' (eg the butt or end of a cigarette).
'port'+'end'='PORTEND'

'of' acts as a link.

Can you help me to learn more?

(Other definitions for portend that I've seen before include "Presage, bode" , "Give warning" , "Signal" , "Omen" , "Be a sign of something to come" .)

I've seen this clue in The Independent.

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