Quick to declare (7)
I believe the answer is:
express
I believe this is a double definition.
'quick' is the first definition.
(I've seen this before)
'declare' is the second definition.
(thesaurus)
'to' acts as a link.
(Other definitions for express that I've seen before include "Utter; speedy" , "Convey in words; train" , "Verbalise - very fast" , "Train; utter" , "Squeeze out - quick" .)