Shrub found in bed on holiday (11)
I believe the answer is:
cotoneaster
'shrub' is the definition.
(cotoneaster is a kind of shrub)
'bed on holiday' is the wordplay.
'bed' becomes 'cot' (cot is a type of bed).
'holiday' becomes 'easter' (Easter is a Christian holiday).
'cot'+'on'+'easter'='COTONEASTER'
'found in' acts as a link.
(Other definitions for cotoneaster that I've seen before include "Shrub with red berries" , "Red-berried garden shrub" , "Plant" .)