Display attitude that's no longer relevant? (10)
I believe the answer is:
exposition
'display' is the definition.
(I've seen this before)
'attitude that's no longer relevant?' is the wordplay.
I cannot quite see how this works, but
'attitude' could be 'position' (position is a kind of attitude) and 'position' is found in the answer.
'no longer' could be 'ex' (prefix meaning former or onetime) and 'ex' is found in the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for exposition that I've seen before include "Account" , "fair" , "commentary" , "Public display" , "large show" .)