A number try out the French shrub (6)
I believe the answer is:
myrtle
'shrub' is the definition.
(myrtle is a kind of shrub)
'a number try out the french' is the wordplay.
'a number' becomes 'm' (M is an example).
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'the french' becomes 'le' ('the' in French).
'try' anagrammed gives 'yrt'.
'm'+'yrt'+'le'='MYRTLE'
(Other definitions for myrtle that I've seen before include "Evergreen shrub with blue-black berries" , "Girl" , "Fragrant evergreen shrub" , "Evergreen shrub; name" , "Evergreen shrub with dark purple berries" .)