Too bright - that’s obvious (7)
I believe the answer is:
glaring
This clue could be a double definition.
'too bright' is the first definition.
'glaring' can be an answer for 'bright' (similar in meaning). I am not sure about the 'too' bit.
'obvious' is the second definition.
(I've seen this in another clue)
'that's' is the link.
Can you help me to learn more?
(Other definitions for glaring that I've seen before include "Dazzling" , "Shining intensely, very obvious" , "Looking daggers; obvious (error)" , "Angrily staring" , "Dazzlingly bright" .)