Heptad (5)

I believe the answer is:

seven

'heptad' is the definition.
(synonyms)

This is all the clue.

(Other definitions for seven that I've seen before include "Little friends of ..." , "Numeral" , "Wonders of the World - Deadly Sins" , "Film" , "Prime number" .)

I've seen this clue in the Penny Press.

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