The most common and most likely answer to this crossword clue is the 12 letter word MANIPULATIVE
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Buddy explains!

The straight part
We know that "as a physiotherapist" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case as a physiotherapist = manipulative.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 MANIPULATIVE mean?
MANIPULATIVE noun- A manipulable object designed to demonstrate a mathematical concept.
- Using manipulation purposefully.
- Tending to manipulate.
- Reaching one's goals at the expense of other people by using them.