Deer eating small flower (4)
I believe the answer is:
rose
'flower' is the definition.
(I've seen this before)
'deer eating small' is the wordplay.
'deer' becomes 'roe' (roe deer is a kind of deer).
'eating' indicates putting letters inside.
'small' becomes 's' (abbreviation - e.g. clothes size).
'roe' enclosing 's' is 'ROSE'.
(Other definitions for rose that I've seen before include "Fragrant flower" , "Moved upwards for the flower" , "Perforated nozzle" , "lifted" , "Garden flower" .)