Shortened form of two books about getting into flying industry (12)
I believe the answer is:
abbreviation
'shortened form' is the definition.
'abbreviation' can be an answer for 'form' (abbreviation is a kind of form). I'm unsure of the 'shortened' bit.
'two books about getting into flying industry' is the wordplay.
I cannot really see how this works, but
'books' could be 'bb' and 'bb' is present in the answer.
'about' could be 're' (common abbreviation for 'with reference to') and 're' is present in the answer.
an anagram of 'into' is 'tion' which is present in the answer.
This explanation may well be incorrect...
'of' is the link.
Can you help me to learn more?
(Other definitions for abbreviation that I've seen before include "USA, say" , "plane, for example?" , "BA, for example" , "Shortening - above Britain (anag)" , "A short word" .)