Travel round America, having time and energy (5)
I believe the answer is:
gusto
'energy' is the definition.
(I've seen this before)
'travel round america having time' is the wordplay.
'travel' becomes 'go' (synonyms).
'round' indicates putting letters inside.
'america' becomes 'us' (abbreviation for the United States).
'having time' becomes 't' (I can't explain this - if you can you should give a lot more credence to this answer).
'us'+'t'='ust'
'go' placed around 'ust' is 'GUSTO'.
'and' is the link.
(Other definitions for gusto that I've seen before include "Relish - zest" , "Zest, zeal" , "Relish; vigour" , "Zest, pleasure in action" , "Obvious enthusiasm" .)