Possible Clues:

• Learner knowing what looks like a cedar but isn't
• Supplier of timber left in front of gateway
• If under fifty, would sound one of the overheads
• Another conifer
• First requirement for lumberjack — knowing a particular tree
• Tree and lake overlooking curved structure
• Early bird endlessly taps tree
• Tree line north of bridge
• Pine kin
• Bend upwards under large tree