Possible Clues:

• See 10
• Don't stand there if you want to keep your job - the one with defined targets to hit
• Forefront of an activity
• Don't stand there if you want to keep your job for hitting one's targets
• 'Clean out your desk!'?
• Position of exposure to criticism
• Turns up if call to railway puts you in danger of being shot down
• Forefront of activity
• We have to let you go, for example, in dangerous position
• Dismissing assembly workers where criticism is inevitable