Photograph last plant (10)
I believe the answer is:
snapdragon
'plant' is the definition.
(snapdragon is a kind of plant)
'photograph last' is the wordplay.
'photograph' becomes 'snap' (synonyms).
'last' becomes 'drag on' (dragging on is a kind of lasting).
'snap'+'dragon'='SNAPDRAGON'
(Other definitions for snapdragon that I've seen before include "One blooming" , "Garden plant" , "Perhaps Christmas entertainment" , "one found in bed" , "one's found in the garden" .)