Devout, laze about round America (7)
I believe the answer is:
zealous
'devout' is the definition.
(thesaurus)
'laze about round america' is the wordplay.
'about' is an anagram indicator.
'round' becomes 'o' (round can mean a round object).
'america' becomes 'US' (United States).
'laze' with letters rearranged gives 'zeal'.
'zeal'+'o'+'us'='ZEALOUS'
(Other definitions for zealous that I've seen before include "Avid" , "Ardently active" , "Intensely enthusiastic" , "Very devoted to a cause" , "Use Zola (anag.)" .)