A will writer can insert a clause saying a beneficiary will receive nothing if they challenge it.

However, clubs are often unable to insert this clause because the player would decline the move.

The world's fourth-biggest oil exporter has inserted a clause in its oil contracts allowing it to request payment in alternative currencies.

I inserted the clause, but you have to honour it because you have taken the money.

An out-of-court settlement was agreed last year and the council inserted a clause under which she had to destroy confidential papers and pledged not to reveal any 'disparaging' information.