Plant bush out around the end of winter (5)
I believe the answer is:
shrub
'plant' is the definition.
(type of plant)
'bush out around the end of winter' is the wordplay.
'out' indicates an anagram (out can mean wrong or inaccurate).
'around' is an insertion indicator.
'the end of' indicates one should take the final letters.
The final letter of 'winter' is 'r'.
'bush' with letters rearranged gives 'shub'.
'shub' enclosing 'r' is 'SHRUB'.
(Other definitions for shrub that I've seen before include "box, say" , "Plant - brush (anag)" , "Low woody perennial type of plant" , "Perhaps Heather" , "Mixed drink of rum, sugar, fruit-juice and spice" .)