Question: Lose weight dramatically, becoming muscular (5)

Hint:

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> Tom's first guess has correctly identified the anagrind and definition.
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Answer: 
Third time lucky 

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>  SWOLE 
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Wordplay is 

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>  LOSE + W (abbrev. of weight) the anagrind is dramatically becoming definition muscular.
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A second more robust try: 

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>  STOUT - muscular 
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With word play 

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>  st as abbreviation for stone(s) as in pounds (lb) and ounces (oz)  
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>  st + out : means stone(s) out (of you) which is to lose weight dramatically.
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 First try: 
Running with this: 

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>  TONED - having firm and well-defined muscles. 
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If this wordplay is fit: 

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>  de-ton: anagram (clued by dramatically), where [de](https://dictionary.cambridge.org/dictionary/english/de) - means lose and ton is a weight. 
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Recover the endless well-being (6)
is it :

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>  a-diet or diets ? -> some crosswords don't show word breakups to keep it challenging not sure if you have done the same or not 
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