Compete with me for an inflorescence (6)
I believe the answer is:
raceme
'for an inflorescence' is the definition.
(raceme is a kind of inflorescence)
'compete with me' is the wordplay.
'compete' becomes 'race' (racing is a kind of competing).
'with' says to put letters next to each other.
'race'+'me'='RACEME'
(Other definitions for raceme that I've seen before include "Long cluster of flowers on one stem" , "Flowers evenly spaced along central stem" , "Care about me with flowers spaced along a central stem" , "Long cluster of flowers along the main stem" , "Cluster of flowers along a central stem" .)