Support Poles travelling around America (8)
I believe the answer is:
espousal
'support' is the definition.
(thesaurus)
'poles travelling around america' is the wordplay.
'travelling' indicates anagramming the letters.
'around' means one lot of letters goes inside another.
'america' becomes 'usa' ('U.S.A.' can be a synonym of 'america').
'poles' with letters rearranged gives 'espol'.
'espol' enclosing 'usa' is 'ESPOUSAL'.
(Other definitions for espousal that I've seen before include "Backing, support" , "championship" , "Acceptance with approval" , "Favourable reception" , "Adoption, support (of)" .)