Innocence of Scot’s refusal to accommodate one old soldier (7)
I believe the answer is:
naivete
'innocence' is the definition.
(I've seen this before)
'scot's refusal to accommodate one old soldier' is the wordplay.
'scot's refusal' becomes 'nae' (I've seen this in another clue).
'to accommodate' is an insertion indicator.
'one' becomes 'i' (Roman numeral).
'old soldier' becomes 'vet' (veteran).
'i'+'vet'='ivet'
'nae' going around 'ivet' is 'NAIVETE'.
'of' is the link.
(Other definitions for naivete that I've seen before include "Greenness" , "Lack of worldliness" , "Ingenuosity" , "Being green" , "Innocence or guillibility" .)