Having, myself, got fifty on "Tropical Fruit" (5)

I believe the answer is:

melon

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'tropical fruit' is the definition.
'melon' can be an answer for 'fruit' (melon is a kind of fruit). I'm not sure about the 'tropical' bit.

'having myself got fifty on' is the wordplay.
'having' becomes 'on' (I can't justify this - if you can you should give a lot more credence to this answer).
'myself' becomes 'me'.
'got' says to put letters next to each other.
'fifty' becomes 'L' (Roman numeral).
'on' means one lot of letters go next to another.
'me'+'l' is 'mel'.
'on' after 'mel' is 'MELON'.

Can you help me to learn more?

(Other definitions for melon that I've seen before include "Edible gourd" , "Sweet juicy gourd" , "Sweet juicy fruit" , "Large vine fruit" , "Member of the gourd family" .)

I've seen this clue in the Evening Standard.

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