Flower to draw endlessly, back at home (5)

I believe the answer is:

lupin

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'flower' is the definition.
(I've seen this before)

'to draw endlessly back at home' is the wordplay.
'to draw' becomes 'nationallottery' (UK prize draw).
'endlessly' indicates the central letters (the ends of the words are removed).
'back at' becomes 'up' (I can't justify this - if you can you should believe this answer much more).
'home' becomes 'in' ('he's home' can mean 'he's in').
The middle of 'nationallottery' is 'l'.
'l'+'up'+'in'='LUPIN'

Can you help me to learn more?

(Other definitions for lupin that I've seen before include "9 [BLOOM]" , "Flower of pea family" , "Tall garden flower" , "Flower with spike of usually purplish-blue flowers" , "Spiky flower" .)

I've seen this clue in The Daily Express.

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