For partner I moved turtle (8)

I believe the answer is:

terrapin

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

'turtle' is the definition.
(I know that terrapin is a type of turtle)

'for partner i moved' is the wordplay.
'partner i' can be anagrammed to 'TERRAPIN'.
But, I am unsure how this is indicated.

Can you help me to learn more?

(Other definitions for terrapin that I've seen before include "Water tortoise" , "Hardback" , "Give out" , "Chelonian reptile" , "Small freshwater turtle" .)

I've seen this clue in The Daily Express.

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