Possible Clues:

• Briefly spot bird lurking inside garden plant
• Plant of the primrose family
• Imperial eagle in Poland is poor man's weather glass
• Much sought-after red agent
• In dreadful peril, men beginning to pile out of plant
• Baroness Orczy's scarlet flower?
• Mischief-maker, flighty type hiding in place — ruddy elusive fellow?
• Target for revolutionary French plant
• Wise briefly to check repeated pressure in poor man's barometer
• Bird in a spot, having lost tail in plant