Sir Lancelot 521

[Mayflower3]

I am stuck on quite a few here.
1a)about to do work of model and rest(6)
1d)wealth of fertile Scottish loch(8)
4a)come up to a parish priest to get fish(8)
13a)true Judaic interpretation of legal authority(10)
15a)mark allowed own ma shockingly to be a strumpet(7,5)????L?? ?????
19d)being sick of Spain's involvement in ownership(7) H?A?ING why healing?

[Lie-in King]

1a Re-pose
1d Rich-Ness
4a A-pp-roach
13a Judicature - anag 'true Judaic'
15a Scar-let woman - ... + anag 'own ma'
19d H-E-aving - E(spana) (in) 'having'

[dhagger]

1a.repose 1d.richness 4a.approach 13a.judicature

[Mayflower3]

Could kick myself,look so obvious now! Many thanks, maybe I can complete it now.