Send down girl who’s out of practice in speaking? (9)
I believe the answer is:
rusticate
'send down' is the definition.
('rusticate' can be a synonym of 'send down')
'girl who's out of practice in speaking?' is the wordplay.
I cannot really understand how this works, but
'girl' could be 'cate' and 'cate' is present in the answer.
This explanation may well be incorrect...
(Other definitions for rusticate that I've seen before include "Ban from college" , "throw off campus" , "Rough up" , "Exile to country" , "Go to countryside" .)