A spree Viv arranged to become widespread (9)
I believe the answer is:
pervasive
'widespread' is the definition.
(I've seen this before)
'a spree viv arranged' is the wordplay.
'arranged' indicates anagramming the letters (letters rearranged).
'a'+'spree'+'viv'='aspreeviv'
'aspreeviv' is an anagram of 'PERVASIVE'.
'to become' is the link.
(Other definitions for pervasive that I've seen before include "Spreading throughout" , "Widely-spread" , "Widespread" .)