Is angry, having to move shrub (7)
I believe the answer is:
syringa
'shrub' is the definition.
(type of shrub)
'is angry having to move' is the wordplay.
'having to move' indicates an anagram.
'is'+'angry'='isangry'
'isangry' is an anagram of 'SYRINGA'.
(Other definitions for syringa that I've seen before include "Lilac (popularly, orange blossom)" , "Flowering shrub" , "Mock orange shrub" , "Mock orange, lilac" , "Is angry (anag.)" .)