Short form (12)
I believe the answer is:
abbreviation
'short form' is the definition.
(abbreviation is a kind of form; 'short' suggests an abbreviation)
This is all the clue.
(Other definitions for abbreviation that I've seen before include "A short word" , "eg, may be one" , "BA, for example" , "plane, for example?" , "EU, for example" .)