One grandmother hold papers, upset, declaring nationality (6)
I believe the answer is:
indian
'declaring nationality' is the definition.
I can't tell whether this defines the answer.
'one grandmother hold papers upset' is the wordplay.
'one' becomes 'i' (Roman numeral).
'grandmother' becomes 'nan' (nan can informally mean a grandmother).
'hold' is an insertion indicator.
'papers' becomes 'ID' (short for identification papers).
'upset' says the letters should be written backwards.
'nan' placed around 'id' is 'naidn'.
'naidn' in reverse letter order is 'ndian'.
'i'+'ndian'='INDIAN'
Can you help me to learn more?
(Other definitions for indian that I've seen before include "May be Asiatic or N. American" , "One from the sub-continent" , "This summer may happen in late autumn" , "Nationality of Salman Rushdie" , "From Kolkata, perhaps" .)