Draws principally involving a plant in Asia (9)

I believe the answer is:

rafflesia

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'plant in asia' is the definition.
'rafflesia' can be an answer for 'plant' (I've seen this before). I am not sure about the 'in asia' bit.

'draws principally involving a' is the wordplay.
'draws' becomes 'raffles' (I've seen this before).
'principally' suggests taking the first letters.
The initial letter of 'involving' is 'i'.
'raffles'+'i'+'a'='RAFFLESIA'

Can you help me to learn more?

(Other definitions for rafflesia that I've seen before include "parasitic plant" , "Plant smelling of carrion; flies afar (anag.)" , "Plant with a large malodorous bloom" .)

I've seen this clue in The Times.

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