Crossword Genius

A relative lack of energy in synthesised androgens (8)

Ross

I believe the answer is:

grandson

'a relative' is the definition.
(grandson is a type of relative)

I don't understand the remainder of the clue.

(Other definitions for grandson that I've seen before include "Junior relative" , "Male child of one's child" , "Young male descendant" , "issue for daughter, perhaps" , "Dons rang (anag) - relative" .)

I've seen this clue in The Independent.
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