Overindulge bear, say (6)
I believe the answer is:
Here is my best explanation:
'overindulge' is the definition.
'bear say' is the subsidiary indication.
'bear' becomes 'panda'.
'say' shows a homophone (sound like).
'panda' is a homophone of 'pander'.
(Other definitions for pander that I've seen before include "Indulge or cater to", "Gratify weakness like a pimp", "Cater for vice or low tastes", "Bow (to)", "Give gratification (to)", "Satisfier of someone's baser wishes", "Cater for debased taste", "Cater rto debased tastes", "Gratify weakness or base tastes" and "Indulge base desires".)