The term 'MORE THAN DUE' can be solved by the crossword solutions TRE and EXCESS. TRE is a three letter word meaning 'too much' or 'more than necessary', while EXCESS is a six letter word meaning 'an amount that is more than what is needed or required'. Together, these two words form the phrase 'MORE THAN DUE', which is used to describe something that is owed or required but has not been paid or fulfilled.