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I have completed the grid but am struggling to see a cryptic indication of the associated title in it. Any tips would be appreciated

Can't help sorry - struggling in TLHC:
1d Mother's done penning books (primarily educational) (6) ABBESS?
11a A first principle, one reflecting Cartesian concepts (5) ??E??
Any hints appreciated.

Yes
Idees (jumbled)

Thanks for that