What does the cryptic crossword clue "Party line developed into mutual exchange (9)" mean?

This cryptic clue uses wordplay to arrive at the answer. Visit the page for progressive hints — definition, wordplay type, and a full step-by-step explanation.

Party line developed into mutual exchange (9)

Guardian Cryptic #25823 | 25 Across | 2012-12-19 flower

← Back to puzzle

Visit Guardian's puzzle site →