Photograph fierce person's flower (10)
I believe the answer is:
snapdragon
'flower' is the definition.
(snapdragon is a kind of flower)
'photograph fierce person's' is the wordplay.
'photograph' becomes 'snap' (synonyms).
'fierce person' becomes 'dragon' (dragon can mean a formidable person).
'snap'+'dragon'='SNAPDRAGON'
(Other definitions for snapdragon that I've seen before include "Garden plant" , "Kind of antirrhinum" , "one's found in the garden" , "that's in the garden?" , "Perhaps Christmas entertainment" .)