1st one - 'as soon as' = gives the first 3 letters of the answer (added to N+D) but it's a 4 letter synonym, so the extra letter has to be accounted for - this is done by adding a letter to 'ape', which gets rid of....
2nd one - is an anagram of 'on' and 'cat', so another letter is needed - 'the face...' (first of) ...tile' gives that letter.
3rd one - another anagram with a surplus letter that must be got rid of -
'one' = I + a 4 letter stringed instrument (add a letter to 'ash' to get rid of...).