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Swamp has a large supervisor (7)

Ross

I believe the answer is:

marshal

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

'supervisor' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'swamp has a large' is the wordplay.
'swamp' becomes 'marsh' (I've seen this in another clue).
'has' says to put letters next to each other.
'large' becomes 'L' (eg in clothes sizes).
'marsh'+'a'+'l'='MARSHAL'

Can you help me to learn more?

(Other definitions for marshal that I've seen before include "Sports event official" , "Arrange in order" , "US law officer" , "first officer" , "Assemble and arrange" .)

I've seen this clue in The Mirror.
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