7 down
Mother
has
fixed
idea
about
River
Island
(7)
Mother has fixed idea about River Island (7)
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The definition is at the end of the clue.
How the clue works
Look at Island at the end — that's your definition. MA is mother, then you need an anagram (that's your "fixed") of idea wrapped around R for River, which gives you DEIRA. Stick MA in front and you're there.