This is silly. 20dn, 'Explanation may start with this - unfortunately a gent blathers, yeah?', (7,5,1,4), T-----Y
-A-G- A ---E. An anagram, obviously, but I cannot get it.
Also, 10dn, 'Scrawny, oddly omitted hiding behind in long garment', (6), C---A-; and 50ac, 'Your setter's given endless criticism, being cryptic', (6), -Y---C.