Possible Clues:

• Addition that extends a main building
• A kiss, say, indicates an attachment
• Completion of sentence after appropriate extension
• Extension building
• Addition to the main building
• Old lover embraced by girl - a bit on the side?
• A girl on the river gets extra room
• Building attached to a largerone
• Small building added to another
• Take over a Wye after this, by the sound of it