Abbreviate (7)
'abbreviate' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for shorten that I've seen before include "contract" , "Prune" , "Clip" , "Curtail" , "Cut back" .)
'abbreviate' is the definition.
(condensing is a kind of abbreviating)
This is all the clue.
(Other definitions for condense that I've seen before include "Make more concentrated or compact" , "cut down" , "Make more concise" , "Decrease, reduce" , "Turn from gas to liquid" .)