Crank letters revealed some sort of chain (6)

I believe the answer is:

anklet

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

'sort of chain' is the definition.
'anklet' can be an answer for 'chain' (I've seen this before). I am unsure of the 'sort of' bit.

'crank letters revealed some' is the wordplay.
'some' indicates a hidden word.
'ANKLET' is hidden within 'crank letters revealed'.

Can you help me to learn more?

(Other definitions for anklet that I've seen before include "Ornament for lower leg" , "Band hanging around low joint" , "Ornamental chain" , "Band worn on leg" , "Foot ornament" .)

I've seen this clue in the Sydney Morning Herald.

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