Concise and full of meaning (5)
I believe the answer is:
pithy
'concise and full of meaning' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for pithy that I've seen before include "Concise and full of meaning" , "Terse, powerful (speech)" , "Cogent" , "Brief, to the point" , "Concise and meaningful" .)