Tricolour's first among equals in flags (6)
I believe the answer is:
peters
'flags' is the definition.
Although both the answer and definition are plural nouns, I can't understand how they can define each other.
'tricolour's first among equals' is the wordplay.
'tricolour's first' becomes 't' (1st letter of 'tricolour').
'among' means one lot of letters goes inside another (inserted letters are placed among others).
'equals' becomes 'peers' (one's peers are one's equals).
't' inserted inside 'peers' is 'PETERS'.
'in' is the link.
Can you help me to learn more?
(Other definitions for peters that I've seen before include "Mary - - , Olympian" , "our 1/4 Across [GOLD MEDALLIST] in 1972" , "25 15 [GOLDMEDALLIST]" .)