Sticking ever-closely to fact? Definitely (3,4)
I believe the answer is:
too true
'sticking ever-closely' is the definition.
I don't know anything about this answer so I can't tell whether this works.
'to fact? definitely' is the wordplay.
I cannot really see how this works, but
'to' is present in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for too true that I've seen before include "Alas you're right" , "You can say that again!" , "You're absolutely right" .)