Chaldean churchman? (4)

I believe the answer is:

dean

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

Here is my best explanation:

'chaldean churchman?' is the definition.
'dean' can be an answer for 'churchman?' (I've seen this before). I'm unsure of the 'chaldean' bit.

'chaldean churchman?' is the wordplay.
'DEAN' is hidden in amongst the letters.
But, I am uncertain how the hidden word is indicated.

Can you help me to learn more?