Crossword Genius

Opens bin out for unwanted parts of fish (3,5)

Ross

I believe the answer is:

pin bones

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

'unwanted parts of fish' is the definition.
I can't judge whether this defines the answer.

'opens bin out' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'opens'+'bin'='opensbin'
'opensbin' with letters rearranged gives 'PIN BONES'.

'for' is the link.

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