Related Clues:

• Difficult being tied up?
• __ pine: paneling wood
• Complicated, like a sandpiper?
• Piece of work, not typically difficult
• Difficult, rugged or intricate
• __ pine
• Tricky to negotiate -- like a reef?
• Tricky, describing wading bird?
• Tricky (to untangle?)
• Nodular
• It's tough not replacing it in central fund
• Complicated, as a problematic tree?
• Intricately tangled
• Troublesome (as reef or sheepshank?)
• Nodular; hard to solve