Contract to appear in Palladium tickled Pink (7)
I believe the answer is:
pleased
'tickled pink' is the definition.
(I've seen this in another clue)
'contract to appear in palladium' is the wordplay.
'contract' becomes 'lease' (lease is a kind of contract).
'to appear in' means one lot of letters goes inside another.
'palladium' becomes 'Pd' (Pd is the chemical symbol for palladium).
'lease' inserted into 'pd' is 'PLEASED'.
(Other definitions for pleased that I've seen before include "Feeling satisfaction" , "Gratified" , "Glad" , "Grateful, delighted" , "Content" .)