Got into a row for having invested in (7)

I believe the answer is:

dressed

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

'invested in' is the definition.
'dressed' can be an answer for 'invested' (thesaurus). I'm unsure of the 'in' bit.

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for dressed that I've seen before include "as a crab may be?" , "Put on clothes" , "Wearing clothes" , "Clad" , "Trimmed" .)

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