Chap's heart stolen by nation of demons? 1/100 (2,9)
I believe the answer is:
de havilland
'stolen by nation of demons? 1100' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.
'chap's heart' is the wordplay.
I cannot really see how this works, but
'heart' could be 'h' (card game abbreviation) and 'h' is found in the answer.
'chap' could be 'land' and 'land' is found within the answer.
This explanation may well be incorrect...
(Other definitions for de havilland that I've seen before include "Aviator" , "Aircraft pioneer" .)