A weird plant (4)

I believe the answer is:

arum

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

'a weird' is the wordplay.
'weird' becomes 'rum' (I've seen this before).
'a'+'rum'='ARUM'

(Other definitions for arum that I've seen before include "Plant like cuckoo pint" , "Type of 1 Across" , "A spirit for a lily" , "Eg, cuckoo pint" , "Cuckoo pint genus" .)

I've seen this clue in The Telegraph.

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