Potential for lasting tangles over in America (7)
I believe the answer is:
stamina
'potential for lasting' is the definition.
I can't tell whether this definition defines the answer.
'tangles over in america' is the wordplay.
'tangles' becomes 'mats' ('mat' can be a synonym of 'tangle').
'over' says the letters should be written in reverse.
'america' becomes 'a' (common abbreviation eg in USA).
'mats' reversed gives 'stam'.
'stam'+'in'+'a'='STAMINA'
Can you help me to learn more?
(Other definitions for stamina that I've seen before include "energy to go on" , "toughness in > male parts" , "Indefatigability" , "Endurance - staying power" , "Vigour" .)