Nickname for British Empire Mail Ship Routes

This page is the CodyCross answer for the clue below from Working From Home, Group 1237, Puzzle 5 (Letter Opener).

Question is: Nickname for British Empire Mail Ship Routes

and the answer is: ALLRED

Word Meaning:

ALL — Every individual or anything of the given class, with no exceptions (the noun or noun phrase denoting the class must be plural or uncountable).

Definitions from Wiktionary.