Daring everyone to enter platform (9)
I believe the answer is:
gallantry
'daring' is the definition.
The definition and answer can be both human attributes as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'everyone to enter platform' is the wordplay.
'everyone' becomes 'all' (all people).
'to enter' indicates putting letters inside.
'platform' becomes 'gantry' (I've seen this before).
'all' going into 'gantry' is 'GALLANTRY'.
Can you help me to learn more?
(Other definitions for gallantry that I've seen before include "Valour" , "Heroism" , "Courageous behaviour" , "Spirit of adventure" , "Bravery" .)