Judicious decisions ultimately will take time (4)
I believe the answer is:
sage
'judicious' is the definition.
(thesaurus)
'decisions ultimately will take time' is the wordplay.
'ultimately' suggests the final letters.
'will take' means one lot of letters go next to another.
'time' becomes 'age' (age is a kind of time**).
The last letter of 'decisions' is 's'.
's'+'age'='SAGE'
(Other definitions for sage that I've seen before include "Seasoning for the wise one" , "Man of wisdom" , "Savant" , "Solon, for instance" , "Clever" .)