A strange sort of lily (4)

I believe the answer is:

arum

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'sort of lily' is the definition.
'arum' can be an answer for 'lily' (a type of lily). I am not sure about the 'sort of' bit.

'a strange' is the wordplay.
'strange' becomes 'rum' (similar in meaning).
'a'+'rum'='ARUM'

Can you help me to learn more?

(Other definitions for arum that I've seen before include "plant with a white spathe" , "Cuckoo-pint" , "A sort of lily." , "Type of plant, lily perhaps" , "A spirit for a lily" .)

I've seen this clue in the Sydney Morning Herald.

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