Essex town of raw fenlands? (7,6)

I believe the answer is:

saffron walden

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

'essex town' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'of raw fenlands?' is the wordplay.
'of raw fenlands' anagrams to 'SAFFRON WALDEN'.
Though, I'm unsure how the anagram is indicated.

Can you help me to learn more?

(Another definition for saffron walden that I've seen is " Essex market town".)

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