Is it forever changing to red? (5)
I believe the answer is:
amber
'red?' is the definition.
The answer and definition can be both human attributes as well as being singular nouns.
Perhaps you can see an association between them that I don't see?
'is it forever changing' is the wordplay.
I cannot really see how this works, but
'is' could be 'be' and 'be' is located in the answer.
This explanation may well be incorrect...
'to' is the link.
Can you help me to learn more?
(Other definitions for amber that I've seen before include "first light" , "Prepare-to-stop signal" , "Medium to dark brownish-yellow colour" , "The traffic-light between red and green" , "Light colour between red and green" .)