Being energetic with something inherited (4)
I believe the answer is:
gene
'something inherited' is the definition.
(I've seen this in another clue)
'being energetic with' is the wordplay.
'with' indicates a hidden word.
'GENE' is hidden in the letters of 'being energetic'.
(Other definitions for gene that I've seen before include "Element of heredity" , "Unit of heredity significance" , "Part of chromosome" , "Something got from parent < for boy" , "Hereditary molecule" .)