Crossword Genius

We start at the first long periods of electrical operating power (8)

Ross

I believe the answer is:

wattages

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'we start at the first long periods of electrical operating power' is the definition.
I can't tell whether this defines the answer.

'we start at the first long periods' is the wordplay.
'start' means to remove the last letter (I've seen 'starts' mean this).
'first' indicates taking the first letters.
'long periods' becomes 'ages' (I've seen this before).
The first letter of 'the' is 't'.
'we' with its final letter removed is 'w'.
'w'+'at'+'t'+'ages'='WATTAGES'

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I've seen this clue in the Sydney Morning Herald.
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