Hi sunray,
In the first clue, you need a 10-letter word (plural) that identifies a group of tradespeople that include wallpaper hangers. Change one of the Rs to an L and add a missing letter.
In the second clue, you are looking for a long form of a four-letter word that refers to something that guitarists use to change the pitch of the strings. This four-letter word can also be the leader of a band of brigands.
Yes, the first down clue is the one beginning “Remain over”.