House doctor's taken advantage of (4)

I believe the answer is:

used

I'm a little stuck... Click here to teach me more about this clue!

'taken advantage of' is the definition.
(I've seen this before)

'house doctor's' is the wordplay.
'USED' is hidden in amongst the letters.
However, I'm not sure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for used that I've seen before include "was milking" , "Scottish expert" , "Subject to exploitation" , "no stranger" , "Pre-loved" .)

I've seen this clue in The Telegraph.

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