Cryptic crossword clue
I don’t approve of this rest treatment as a provider of energy 7

The most common and most likely answer to this crossword clue is the 7 letter word BOOSTER

I've seen this crossword clue in The Guardian
B
O
O
S
T
E
R

Buddy explains!

The straight part
We know that "provider of energy" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case provider of energy = booster.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does BOOSTER mean?

BOOSTER noun
  1. Something that boosts.
  2. The first stage of a multistage rocket that provides the thrust for liftoff and the initial flight
  3. A motor-generator set used for voltage regulation in direct current electrical power circuits.
  4. Someone who is a fan or supporter of something.
  5. Someone who promotes a town or business
  6. A member of a booster club.
  7. A booster dose.
  8. A term that serves to amplify or strengthen an utterance, such as "really".
  9. A power-up item.
  10. A package of cards or figurines designed to add to a player's collection.
  11. A thief.

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