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They're apt to have their variations (6)

Ross

I believe the answer is:

themes

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'variations' is the definition.
The answer and definition can be both related to communication as well as being plural nouns.
Maybe they are linked in a way I don't understand?

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for themes that I've seen before include "'Subjects, topics (6)'" , "Subjects or repeated melodies" , "Subjects or repeated musical pieces" , "Motifs, subjects" , "Subjects or unifying ideas" .)

I've seen this clue in the Evening Standard.
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