English flower for each one canvassed (6)
I believe the answer is:
camper
'one canvassed' is the definition.
(someone camping in a canvas tent)
'english flower for each' is the wordplay.
'english flower' becomes 'cam' (River Cam in Cambridge, something which flows).
'for each' becomes 'per' (I've seen this before).
'cam'+'per'='CAMPER'
(Other definitions for camper that I've seen before include "Overnight van" , "Holidaymaker with tent" , "Vehicle for living in" , "Tent resident" , "Van in which to live on the road" .)