Signals transmitted if craft destroyed (7)

I believe the answer is:

traffic

I'm a little stuck... Click here to teach me more about this clue!

'signals transmitted' is the definition.
I can't tell whether this defines the answer.

'if craft destroyed' is the wordplay.
'destroyed' 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 "Vehicles on the road" , "Movement of vehicles" , "Business" , "Illegal trading" , "Vehicle flow" .)

I've seen this clue in The Telegraph.

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