Possible Clues:

• Convert a slattern who's messy
• Make understandable
• Change to another language
• Evidence of railway delays one is wanting to make comprehensible
• Decode, in a way
• Put in other words, tutor's not one to criticise severely
• Change coaches, one having left behind schedule
• Tell us in plain English what the Irish are saying to Express in an altogether different language
• Ant alters novel to put it another way
• Interpret Japanese into English