Possible Clues:

• Rock used to build Tangier
• Constituent in Dartmoor in great trouble
• It's very hard to get Ulster into the fireplace
• It's very hard to get the North into the fireplace
• It is hard to get in upside down in the fireplace
• Symbol of hardness
• New Hampshire (with ''state'')
• Old dear, I note, is hard by nature
• Rock played in Tangier
• Old lady getting with it - recreational drug and rock!