Their owners should be able to present a reasonable case (7,5)

I believe the answer is:

logical minds

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'their owners should be able to present a' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'reasonable case' is the wordplay.
'reasonable' becomes 'logical' (associated in meaning).
'case' becomes 'minds' (I can't explain this - if you can you should believe this answer much more).
'logical'+'minds'='LOGICAL MINDS'

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I've seen this clue in The Globe and Mail.

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