Acrostic: Take the first letters from words in the clue
"Animals came over with shaved heads (4)" gives COWS
Anagram: All the right letters are in the clue, just in the wrong order
"Deliver composed verse (5)" gives SERVE
Charades: Replace words in the clue with synonyms or abbreviations
"Dealing with money, exclude monarch (7)" gives BANKING
There is also one &lit clue, in which the whole clue acts as both wordplay and definition