Related Clues:

• Female jam-makers perhaps study spread
• Extend central London home
• Expand Women's Institute's meeting-place
• Poke (out)
• Extend (out)
• Edwin (anag)
• Add lanes to, as a road
• Let out new clothing DI brought back
• Increase one dimension of study in Mayfair?
• Become broader
• Add more lanes to, as a highway
• Make Broad an extra batsman at the end
• Protrude, like Jay Leno's chin
• Old invader's unfinished project
• Protrude (with "out")