Sisters beg outside independent energy suppliers' summit (8)

I believe the answer is:

pleiades

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'sisters beg outside independent energy suppliers' summit' is the definition.
I can't judge whether this defines the answer.

'beg outside independent energy suppliers' summit' is the wordplay.
'beg' becomes 'plead' (I've seen this before).
'outside' means one lot of letters goes inside another (some letters go outside others).
'independent' becomes 'i'.
'summit' indicates taking the first letters (the letter at the top is the summit).
The first letters of 'energy suppliers' is 'es'.
'plead' enclosing 'i' is 'pleiad'.
'pleiad'+'es'='PLEIADES'

Can you help me to learn more?

(Other definitions for pleiades that I've seen before include "night-time sight" , "Seven Sisters constellation" , "Star cluster representing sisters in mythology" , "Cluster of stars in Taurus" , "Daughters of Atlas - Seven Sisters star cluster in Taurus" .)

I've seen this clue in The Independent.

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