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[dave1948]

2d Changed muted loud reading (9)
M?D?L?T??
Modulated is the only answer I can come up with (but not an anagram !)

17a Old instruments in hospital wards(4)
A???
3rd letter is d if modulated is right

[frugalfred]

2 modulated (it's an anagram of "mated loud" is it a misprint?)

[Mamyalynne]

Ards

[dave1948]

Thank you Mamyalynne what are ards ??

[frugalfred]

The ard or scratch plough is a type of simple plough. It consists of a frame mounting a nearly vertical wooden spike, which is dragged through the soil by draught animals. ..this might help.

[dave1948]

Thank you Frugalfred and Mamyalynne.

I am sure you are both right but 17a and 2d are both clues from a lazy setter and ards is a bit obscure Why use hospital ??