More than one fool performs outside front of Palladium (5)
I believe the answer is:
dopes
'more than one fool' is the definition.
(I've seen this before)
'performs outside front of palladium' is the wordplay.
'performs' becomes 'does' ('do' can be a synonym of 'perform').
'outside' indicates putting letters inside.
'front of' says to take the initial letters.
The initial letter of 'palladium' is 'p'.
'does' placed around 'p' is 'DOPES'.
(Other definitions for dopes that I've seen before include "Nobbles" , "Fools" .)