Some of these clues are good, but the lure of reading outside on a nice weekend day really impinged on my ability to write a grid in a timely fashion.
Hopefully it's still a somewhat enjoyable solve!
1A Def Supports Wordplay D-def with retreats
6A Def Still well known Wordplay Goldilocks (porridge eater) - glocks (pieces) + e (second bEar)
7A Def Never Wordplay Homophone (heard) of 'know' (sense)
8A Def Royal one Wordplay Wee - central letter. Very similar to previous clue :/
9A Def Prior to Wordplay U (universal) + N (direction / North) + TI (final note from do re mi ...) + L (50)
11A Def The blue Wordplay Seal (Pinniped) - L (Hand)
1D Def Extra Wordplay Onus (responsibility) after 'b' (first Baby)
2D Def Deserted Wordplay Al (gangster) + On (about) + E (drug)
3D Def Record Wordplay Odd letters of CoDe
4D Def Flightless bird Wordplay K (A thousand) + I (one) + W (initially Wowed) + I (island)
5D Def Closes eyes shut Wordplay Sleeps (rests) reversed (up), missing a 'p' (central purPose)
10D Def Thank Wordplay Remove 'b' (to top is to cut the head off) from 'bat', and reverse it