Sea creature mine (6)

I believe the answer is:

limpet

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

This might be a double definition.

'sea creature' is the first definition.
'limpet' can be an answer for 'creature' (limpet is a kind of creature). I am unsure of the 'sea' bit.

'mine' is the second definition.
(I've seen this before)

Can you help me to learn more?

(Other definitions for limpet that I've seen before include "Adhesive mollusc" , "Gastropod that sticks to rocks" , "sticker?" , "Cinging mollusc" , "clingy type" .)

I've seen this clue in The Sun.

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