Overly intimate to visit? It's a toss-up! (3,5,2,4)
I believe the answer is:
too close to call
'a toss-up' is the definition.
I know nothing about this answer so I cannot tell whether this works.
'overly intimate to visit?' is the wordplay.
'overly' becomes 'too' (to too great a degree).
'intimate' becomes 'close' (similar in meaning).
'visit?' becomes 'call' ('call' can be a synonym of 'visit').
'too'+'close'+'to'+'call'='TOO CLOSE TO CALL'
'it's' acts as a link.
Can you help me to learn more?
(Other definitions for too close to call that I've seen before include "Not far enough away for visit" , "Marginal" .)