Queen's person in general with energy prominently visible for long periods (4)
I believe the answer is:
eons
'long periods' is the definition.
(I've seen this in another clue)
'queen's person in general with energy prominently visible' is the wordplay.
I cannot quite understand how this works, but
'energy' could be 'e' (physics symbol as in E=mc2) and 'e' is found in the answer.
The remaining letters 'ons' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
'for' is the link.
Can you help me to learn more?
(Other definitions for eons that I've seen before include "Divisions of archaeological time" , "Years and years" , "Nose (anag)" , "Times" , "Endless periods" .)