Goods transported if craft's at sea (7)

I believe the answer is:

traffic

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'goods transported' is the definition.
I can't tell whether this defines the answer.

'if craft's at sea' is the wordplay.
'at sea' indicates an anagram.
'if'+'craft'='ifcraft'
'ifcraft' is an anagram of 'TRAFFIC'.

Can you help me to learn more?

(Other definitions for traffic that I've seen before include "Illegally push" , "Communications" , "Smuggle" , "Movement along a route" , "Lots of vehicles" .)

I've seen this clue in The Telegraph.

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