Result of a fallout in wireless traffic (13)
I believe the answer is:
radioactivity
'result of a fallout' is the definition.
'radioactivity' can be an answer for 'fallout' (thesaurus). I am unsure of the 'result of a' bit.
'wireless traffic' is the wordplay.
'wireless' becomes 'radio' (synonyms).
'traffic' becomes 'activity' (I can't justify this - if you can you should give a lot more credence to this answer).
'radio'+'activity'='RADIOACTIVITY'
'in' is the link.
Can you help me to learn more?
(Other definitions for radioactivity that I've seen before include "Spontaneous emission of energy from atomic nuclei" , "Emission from, eg, uranium" , "caused by emission of particles" , "Emission disintegrating atomic nuclei give out" .)