Flowers gathered in central Belize, Calais and Tucson (6)

I believe the answer is:

lilacs

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'flowers' is the definition.
(I have seen 'Purple flowers ' mean 'lilacs' so perhaps 'flowers' could also mean 'lilacs')

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for lilacs that I've seen before include "trees" , "Large fragrant flowers of white and mauve" , "Purple flowers" , "''We'll gather ... in the the spring'' (Ivor Novello song)" , "Bloomers" .)

I've seen this clue in The Irish Times.

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