Earn medal presented by king in castle (7)

I believe the answer is:

windsor

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

'castle' is the definition.
(I've seen this before)

'earn medal presented by king' is the wordplay.
'earn' becomes 'win'.
'medal' becomes 'dso' (I can't explain this - if you can you should give a lot more credence to this answer).
'presented by' says to put letters next to each other.
'king' becomes 'R' (abbreviation for rex, king in Latin).
'win'+'dso'+'r'='WINDSOR'

'in' is the link.

Can you help me to learn more?

(Other definitions for windsor that I've seen before include "town near Eton" , "Royal palace" , "Home to Shakespeare's merry wives" , "Noble family" , "Thames town" .)

I've seen this clue in The Telegraph.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.