Artless individual in group giving off singular energy (7)

I believe the answer is:

ingenue

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'artless individual' is the definition.
'ingenue' can be an answer for 'individual' (ingenue is a kind of individual). I'm unsure of the 'artless' bit.

'in group giving off singular energy' is the wordplay.
'group giving off singular' becomes 'genu' (I can't justify this - if you can you should give a lot more credence to this answer).
'energy' becomes 'e' (physics symbol as in E=mce).
'in'+'genu'+'e'='INGENUE'

Can you help me to learn more?

(Other definitions for ingenue that I've seen before include "Inexperienced young woman" , "Starlet" , "Innocent young woman in play" , "Naive girl" , "Genuine (anag.)" .)

I've seen this clue in The Times.

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