The jagged rock rose straight (6)

I believe the answer is:

hetero

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'straight' is the definition.
(short for heterosexual)

'the jagged rock rose' is the wordplay.
'the jagged' becomes 'het' (I am not sure about this - if you are sure you should believe this answer much more).
'rock' becomes 'ore' (ores are found in rocks).
'rose' shows that the letters should be reversed in order.
'ore' in reverse letter order is 'ero'.
'het'+'ero'='HETERO'

Can you help me to learn more?

(Other definitions for hetero that I've seen before include "Straight (abbr)" , "Person attracted to the opposite sex (abbr)" , "Prefix signifying other" .)

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

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