Untiring when debating life travelling round America (13)
I believe the answer is:
indefatigable
'untiring' is the definition.
(thesaurus)
'debating life travelling round america' is the wordplay.
'travelling' is an anagram indicator.
'round' is an insertion indicator.
'america' becomes 'a' (common abbreviation - e.g. in organisation names).
'debating'+'life'='debatinglife'
'debatinglife' with letters rearranged gives 'indeftigable'.
'indeftigable' going around 'a' is 'INDEFATIGABLE'.
'when' is the link.
(Other definitions for indefatigable that I've seen before include "Relentless" , "Tireless" , "Persistent" , "with no end of energy" , "Persisting tirelessly" .)