I add blue variegated plant (8)

I believe the answer is:

buddleia

'plant' is the definition.
(buddleia is a kind of plant)

'i add blue variegated' is the wordplay.
'variegated' is an anagram indicator.
'i'+'add'+'blue'='iaddblue'
'iaddblue' anagrammed gives 'BUDDLEIA'.

(Other definitions for buddleia that I've seen before include "Butterfly bush" , "Ornamental plant" , "Small coin of Mexico, Brazil" , "flowering plant" , "Common shrub attractive to butterflies" .)

I've seen this clue in The Telegraph.

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