Restrained and looking embarrassed after breaking teeth (8)
I believe the answer is:
tethered
'restrained' is the definition.
(I've seen this before)
'looking embarrassed after breaking teeth' is the wordplay.
'looking embarrassed' becomes 'red' (I've seen this before).
'after' is a charade indicator (letters next to each other).
'breaking' indicates anagramming the letters.
'teeth' with letters rearranged gives 'tethe'.
'red' put after 'tethe' is 'TETHERED'.
'and' acts as a link.
(Other definitions for tethered that I've seen before include "Of animal, secured or hobbled" , "on a leash" , "Bound" , "Not free" , "Tied (animals) up" .)