Anxious for the future, say (5)
I believe the answer is:
tense
I believe this is a double definition.
'anxious' is the first definition.
(thesaurus)
'the future say' is the second definition.
(future is a kind of tense)
'for' acts as a link.
(Other definitions for tense that I've seen before include "past, say" , "past possibly" , "Verb form indicating time" , "Could be present" , "Not relaxed" .)