It’s one of the relatives you name. Specifically you want an “isle”, not an “island”. Maybe easier for a UK-based solver. And the answer is an idiom for “costing a bomb”
I got the answer "an arm and a leg", A, GRAN returning holding man (island) and dale (valley). Phew. Could never have dreamt of the answer without your help. Thanks Quisling for your neat parsing.
Please help me in parsing / solving this cryptic clue -
"Objects in a row tipping completely (3,4,2)"
Looks completely is the definition. There are many idioms like, all ends up, all over it, But unable to parse any.