Crossword Genius

Casual type of relationship old queen has available (7)

Ross

I believe the answer is:

onoffer

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'casual type' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'relationship old queen has available' is the wordplay.
'relationship old' becomes 'off' (I can't explain this - if you can you should give a lot more credence to this answer).
'queen' becomes 'ER' (abbreviation for Elizabeth Regina).
'has' is a charade indicator (letters next to each other).
'available' becomes 'on' (on can mean activated or available).
'off'+'er'='offer'
'offer' after 'on' is 'ONOFFER'.

'of' acts as a link.

Can you help me to learn more?

I've seen this clue in The Guardian.
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