Possible Clues:

• Really dull but sharp fencing museum subject in McLean, TX
• Beware bird flying between poles in the countryside
• Creates a barrier with cutting type of cable from old poet taking in Belgium with women from Ireland
• Telegraph on pointed barrier to progress
• Prison camp barrier
• Being desperate, one bar brewed something to prevent you moving on!
• Range barrier
• Sharply worded cable about wartime obstacle
• Deterrent fencing
• Hurtful old kind of message that creates barrier