Good to harness energy of member of younger generation (5)
I believe the answer is:
niece
'member of younger generation' is the definition.
'niece' can be an answer for 'member' (I have seen 'Member of family' mean 'niece' so perhaps 'member' could also mean 'niece'). I'm not certain of the 'of younger generation' bit.
'good to harness energy' is the wordplay.
I cannot really see how this works, but
'energy' could be 'e' (physics symbol as in E=mc2) and 'e' is located in the answer.
'good' could be 'nice' (similar in meaning) and 'nice' is found within the remaining letters.
No letters remain.
This may be the basis of clue (or it may be nonsense).
'of' acts as a link.
Can you help me to learn more?
(Other definitions for niece that I've seen before include "Brother's daughter" , "Female family member" , "Brother's girl" , "member of different generation" , "Preparation for curdling milk" .)