Measure the announced route (5)
I believe the answer is:
weigh
'measure' is the definition.
(weighing is a kind of measuring)
'the announced route' is the wordplay.
'the announced' shows a homophone (sound like).
'route' becomes 'way' (way is a kind of route).
'way' is a homophone of 'WEIGH'.
(Other definitions for weigh that I've seen before include "Bear down oppressively" , "Estimate the value of" , "Assess" , "Put in the balance?" , "Estimate the heaviness of" .)