Possible Clues:

• Sweetbriar
• Inelegant (anag) — plant
• Fragrant species of wild rose, the sweetbrier
• Plant, say, with insect in groove?
• For example worker in railway plant
• A bloomer, blowing up before end of England tie?
• Is the blooming, broken engine about to 'alt?
• Wild rose, for example, on worker in queue
• It was lush, and seen in the warm hedge by Shelley
• Awfully inelegant wild rose