A shy criminal will import wild garden shrubs (10)
I believe the answer is:
hydrangeas
'shrubs' is the definition.
(hydrangea is a kind of shrub)
'a shy criminal will import wild garden' is the wordplay.
'criminal' indicates anagramming the letters.
'will import' means one lot of letters goes inside another.
'wild' indicates anagramming the letters.
'a'+'shy'='ashy'
'ashy' with letters rearranged gives 'hyas'.
'garden' anagrammed gives 'drange'.
'hyas' placed around 'drange' is 'HYDRANGEAS'.
(Other definitions for hydrangeas that I've seen before include "Flowering plants; ashy garden (anag.)" , "Garden shrubs" .)