Deceive having hand cover that's a bloomer! (8)
I believe the answer is:
foxglove
'that's a bloomer' is the definition.
(flower that blooms)
'deceive having hand cover' is the wordplay.
'deceive' becomes 'fox' (foxing is a kind of deceiving).
'having' says to put letters next to each other.
'hand cover' becomes 'glove' (I've seen this before).
'fox'+'glove'='FOXGLOVE'
(Other definitions for foxglove that I've seen before include "Flowering plant that's source of digitalis" , "Animal and hand-covering for a plant" , "that grows wild" , "Tall plant with purple or white flowers - vulpine?" , "Source of 1 dn" .)