He may be seen working in bed (8)
I believe the answer is:
gardener
'he' is the definition.
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for gardener that I've seen before include "One grows" , "Garnered by worker on cultivated ground" , "Horticulturist" , "one working on plot?" , "Horticulturalist" .)