Outlook following a hint about temperature, it's below 90 degrees (5,5)
I believe the answer is:
acute angle
'it's below 90 degrees' is the definition.
I can't judge whether this definition defines the answer.
'outlook following a hint about temperature' is the wordplay.
'outlook' becomes 'angle' (as in a journalist's angle on a story).
'following' is a charade indicator (letters next to each other).
'hint' becomes 'cue' (cue can mean a hint or prompt).
'about' indicates putting letters inside.
'temperature' becomes 't' (abbreviation).
'cue' going around 't' is 'cute'.
'a'+'cute'='acute'
'angle' put after 'acute' is 'ACUTE ANGLE'.
Can you help me to learn more?
(Other definitions for acute angle that I've seen before include "That can't be right - it's smaller" , "Meeting point" , "tighter corner" , "That's not right" .)