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Thanks all...yes a typo in the last clue... should be "has us".
I blame the predictive texting on my phone.

9a. The solver's breakfast finally includes good dairy product
YOGURT

17a. Shower much they stripped off
DOUCHE

11d. Sister working to inspire senior to keep going
SOLDIER ON

19a. Low wall: section breached by clumsy type
PARAPET

Parses for the above please.

9 Your, the solver's, breakfasT, breakfast finally, with G, good inside (includes good). Yogurt, dairy product.

19 Parapet, low wall. Part, section, with Ape, clumsy type inside (breached by) Par ape t.

Whetstone, you missed out a crucial part of 17 A. The wording is

Shower party - much they stripped off.
Do, party and mUCh tHEy. (stripped off, use the inside letters).
Douche, shower.

Thanks for the answers.
Re 17a...I copied it verbatim, so must be a printing error.
Cheers

16d. Animated sailor, Leo, perhaps, meeting you
POPEYE

14d. Scottish monarch's horse is able
DUNCAN

1a. Writing for foreign film implied accepting sex
SUBTITLE

Parses for the above please.

14. DUN (a horse of that colour) + CAN (able)

1. SUBTLE (implied) around IT (sex)

several leos have been pope, then ye - old form of you

Thanks for the replies.
IT means 'sex'? Is this the 1970s?!
Cheers