One accompanies an Indian relative touring America (4)
I believe the answer is:
'one accompanies an indian' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.
'relative touring america' is the wordplay.
'relative' becomes 'nan' (informal term for a grandmother).
'touring' is an insertion indicator (touring can mean going round).
'america' becomes 'a' (common abbreviation - e.g. in organisation names).
'nan' going around 'a' is 'NAAN'.
Can you help me to learn more?
(Other definitions for naan that I've seen before include "Indian bread shaped like a teardrop" , "Indian food" , "Indian type of bread" , "Indian leavened bread" , "Slightly leavened bread" .)