Crossword Genius

Maximum rate for a spinner? (3,5)

Ross

I believe the answer is:

top speed

I'm a little stuck... Click here to teach me more about this clue!

'maximum' is the definition.
Both the answer and definition are adjectives.
Maybe there's an association between them I don't understand?

'rate for a spinner?' is the wordplay.
'rate' becomes 'speed' (speed is a kind of rate).
'for' means one lot of letters go next to another (I've seen this in other clues).
'a spinner?' becomes 'top' (a spinning top).
'speed' put after 'top' is 'TOP SPEED'.

Can you help me to learn more?

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