I call out for a syringa (5)
I believe the answer is:
lilac
'syringa' is the definition.
(I know that syringa can be written as lilac)
'i call out' is the wordplay.
'out' is an anagram indicator (out can mean wrong or inaccurate).
'i'+'call'='icall'
'icall' with letters rearranged gives 'LILAC'.
'for a' is the link.
(Other definitions for lilac that I've seen before include "Pinkish purple - shrub" , "Pale purple - flowering tree" , "I call (anag)" , "Shrub with fragrant pink, purple or white flowers" , "Shrub with fragrant purplish or white flowers" .)