Book that is including design for aircraft (7)
I believe the answer is:
biplane
'aircraft' is the definition.
(biplane is a kind of aircraft)
'book that is including design' is the wordplay.
'book' becomes 'b'.
'that is' becomes 'ie' ('i.e.' can be a synonym of 'that is').
'including' is an insertion indicator.
'design' becomes 'plan' ('plan' can be a synonym of 'design'**).
'ie' enclosing 'plan' is 'iplane'.
'b'+'iplane'='BIPLANE'
'for' acts as a link.
(Other definitions for biplane that I've seen before include "flying machine" , "Eg, Tiger Moth" , "Early aircraft" , "craft" , "Aircraft with double wings" .)