Possible Clues:

• So long in business, he overcomes mounting anger
• Final word, taking a penny off inexpensive English port
• I'm off to celebrate a narrow football victory?
• Character abroad, always confined, having nothing for so long
• Expression used when leaving meal, say, I love
• See you dispose of last two bits of Stilton, say, with port
• So, long rice hoe is broken
• First couple in Channel port keeping quarters for so long
• Put one's hands together for Number 10 - having said that, will they Leave?
• Root for instance, often initially is so long