Hi FemmeNoire,
There's a glossary of terms related to the theme on Wikipedia but I suppose you have to know the word in order to look it up so...
2d - 3 letters foe "court" + single letter "daughter" then the second word is an anagram/"dancing" - definition is "bird" as it relates to 1d.
11d - Is an odd word that you will definitely know but have probably never used - 5 letter "former party leader" around an anagram/"mess" of a 4 letter word in the clue - definition is "can be excused" but although it's in Chambers it's not on some other word search sites.
25a - Is a 4 letter anagram inside 2 letter "books" + single letter "yankee" - definition is "something unusual".