I eventually twigged on that one, but I found it in the crossword dictionary. I wasn't familiar with the term. It is an abbreviation for the main man I believe.
Thanks andy, was trying to work on French & Italian 'theme', OS lost me. All's well here thank you, trust you are, weather not beeb too bad. makes a change NOT to have IoM in clues!
We seem to have missed it all again. Worried about Isle, can't contact them. They always struggle with West S/W winds, straight in harbour off sea. Regularly flood, 30+ft tides are usual