Daisy with knight behind (6)
I believe the answer is:
astern
'behind' is the definition.
(at the back or behind of a ship)
'daisy with knight' is the wordplay.
'daisy' becomes 'aster' (I've seen this before).
'with' is a charade indicator (letters next to each other).
'knight' becomes 'n' (chess abbreviation).
'aster'+'n'='ASTERN'
(Other definitions for astern that I've seen before include "The wake is" , "State of S central US" , "following behind vessel" , "Abaft" , "Towards back of boat" .)