6d. one who progresses by rule of thumb? 5-5 letters. ?I?c? H?a?r
9d. nevertheless locks are needed for building supports, 10 letters. B?t?r???t?.
18x. to turn the wench into a winch. 8 letters. ?I?e???s.
19d. Humble sailor in rough sea. 5 letters. ??b?e, (not sure if the b should be in this word)