Detect person's elastic slipping, a source of optimistic views (4-6,10)
I believe the answer is:
rose-tinted spectacles
'detect person's elastic slipping a source of optimistic views' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.
'detect person's elastic slipping a source of optimistic views' is the wordplay.
'slipping' indicates an anagram.
'a source of optimistic views' becomes 's' (I am not sure about this - if you are sure you should believe this answer much more).
'detect'+'person'+'elastic'='detectpersonelastic'
'detectpersonelastic' is an anagram of 'rosetintedspectacle'.
'rosetintedspectacle'+'s'='ROSE-TINTED SPECTACLES'
Can you help me to learn more?
(Another definition for rose-tinted spectacles that I've seen is " They give an unduly optimistic perspective on things".)