Related Clues:

• Essential thing
• If __ be
• More than a shortage
• Absence
• ''Mr. Watson ... I ___ you!'' (A.G. Bell)
• Straits
• Scholarship consideration
• 'That's all I ___'
• No frill, this
• It's not an option
• Something missing
• Urgent want
• Financial aid basis
• It might be dire
• Food or water, e.g.