The most common and most likely answer to this crossword clue is the 14 letter word ABDOMINOPLASTY
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Buddy explains!
The straight part
We know that "A lax body — most common in mums — during surgery, finally tucked up?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case a lax body — most common in mums — during surgery, finally tucked up? = abdominoplasty.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 ABDOMINOPLASTY mean?
ABDOMINOPLASTY noun- The surgical removal of excess flesh from the abdomen, usually for cosmetic reasons.