Loaded back-up, losing good megawatts supply (4,4)

I believe the answer is:

swat team

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'loaded back-up' is the definition.
I know nothing about this answer so I can't tell whether this works.

'losing good megawatts supply' is the wordplay.
'losing' suggests deleting specific letters.
'good' becomes 'g' (abbreviation).
'supply' indicates anagramming the letters (in a supple way).
'megawatts' with 'g' removed is 'meawatts'.
'meawatts' is an anagram of 'SWAT TEAM'.

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I've seen this clue in The Independent.

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