Possible Clues:

• Flower for the (say) sinner and the song
• Plant, during historical period, run inside spy organisation
• Offender zone, say, that's found in garden centre
• Composite plant - mostly scarce one, amateur got on film
• Plant that's excellent, remarkable and mostly delicate shooting up
• Sounds like the blooming song of the sinner
• A number in time look to raise such a plant
• Heard someone doing wrong song - 'Where the Dead Men Go'
• Daisy, Carrie and Ian in a strange relationship
• Film artist takes look over plant