Bear eating egg? That's bland (6)
I believe the answer is:
boring
'bland' is the definition.
(thesaurus)
'bear eating egg?' is the wordplay.
'bear' becomes 'bring' (both can mean to carry).
'eating' means one lot of letters goes inside another.
'egg?' becomes 'o' (an 'o' resembles an egg).
'bring' placed around 'o' is 'BORING'.
'that's' is the link.
(Other definitions for boring that I've seen before include "Drilling can be tedious" , "Tedious, tiresome" , "flat" , "Tedious and tiring" , "Making holes" .)