I give in ! Nearly there , but I just can't get my last 3.
52a) Journalist serving American holds forth bottles for stars(3,6) I have R?D ???N?S
46a) One's thick skinned, heading off chaos and trouble(7) I have A?O???O. (Avocado???)
45d) Documents of old photographer found by younger one(6) I have ???Y??.
Any help would be very much appreciated!