Try to make money having lost your shirt? (6)

I believe the answer is:

invest

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

'try to make money' is the definition.
(people make investments in order to make money)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for invest that I've seen before include "Eg, buy stocks and shares" , "Buy shares; besiege" , "Contribute money in hope of a return" , "sink" , "Lay siege" .)

I've seen this clue in The Guardian.

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