Crossword Genius

It may be cultivated for example in a rum cocktail (8)

Ross

I believe the answer is:

geranium

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'it may be cultivated' is the definition.
The definition suggests a singular noun which matches the answer.

'example in a rum cocktail' is the wordplay.
'example' becomes 'ge' (I can't justify this - if you can you should believe this answer much more).
'cocktail' indicates an anagram.
'in'+'a'+'rum'='inarum'
'inarum' is an anagram of 'ranium'.
'ge'+'ranium'='GERANIUM'

'for' is the link.

Can you help me to learn more?

(Other definitions for geranium that I've seen before include "Popular flowering pot plant" , "Cultivated pelargonium" , "I run game to get colourful flower for windowbox" , "Flower for a strange Maine rug" , "Cultivated cranesbill" .)

I've seen this clue in The Globe and Mail.
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