Short journey to exchange safety device (4,6)

I believe the answer is:

trip switch

'safety device' is the definition.

'short journey to exchange' is the wordplay.
'short journey' becomes 'trip' (I've seen this before).
'to exchange' becomes 'switch' (switching is a kind of exchanging).
'trip'+'switch'='TRIP SWITCH'

I've seen this clue in The Telegraph.

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