Foolishly, she can -- accommodating idiot Englishman (9)
I believe the answer is:
sassenach
'englishman' is the definition.
(Sassenach is an example)
'foolishly she can accommodating idiot' is the wordplay.
'foolishly' indicates anagramming the letters.
'accommodating' indicates putting letters inside.
'idiot' becomes 'ass' (I've seen this before**).
'she'+'can'='shecan'
'shecan' with letters rearranged gives 'senach'.
'senach' going around 'ass' is 'SASSENACH'.
(Other definitions for sassenach that I've seen before include "In Scotland, English" , "who comes from England?" , "English person (to a Scot)" , "Englishman, Lowlander" , "Lowland Scot" .)