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Gripe about energy renewed when it's nearest to us (7)

Ross

I believe the answer is:

perigee

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'nearest to us' is the definition.
I can't judge whether this definition defines the answer.

'gripe about energy renewed when' is the wordplay.
'about' says to put letters next to each other.
'energy' becomes 'e' (physics symbol as in E=mc2).
'renewed' indicates an anagram.
'when' becomes 'e' (I've seen this in other clues).
'gripe' put after 'e' is 'egripe'.
'egripe' is an anagram of 'perige'.
'perige'+'e'='PERIGEE'

'it's' is the link.

Can you help me to learn more?

(Other definitions for perigee that I've seen before include "Point where the Moon is closest to the Earth" , "A low point" , "Point of orbit nearest earth" , "Point of orbit closest to the earth" , "where orbit's lowest" .)

I've seen this clue in The Daily Express.
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