Very succinctly (2,1,4)
I believe the answer is:
in a word
'very succinctly' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for in a word that I've seen before include "concise" , "Briefly - won raid (anag)" , "To summarise very briefly" , "To summarize" , "Where letters are usually found" .)