Pleased to be lucky (5)
I believe the answer is:
happy
I believe this is a double definition.
'pleased' is the first definition.
(pleased means contented)
'lucky' is the second definition.
(thesaurus)
'to be' acts as a link.
(Other definitions for happy that I've seen before include "Doc's smiling pal" , "Pleased, content" , "One of the Seven Dwarves" , "Fortunate; content" , "Joyous" .)