Crossword Genius

Keep can over fish piece (8,6)

Ross

I believe the answer is:

stirling castle

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

'piece' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'keep can over fish' is the wordplay.
I cannot quite see how this works, but
'keep' could be 'castle' (I've seen this before) and 'castle' is found within the answer.
'can' could be 'stir' (I've seen this before) and 'stir' is located in the answer.
'fish' could be 'ling' (ling is a kind of fish) and 'ling' is located in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Telegraph.
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