Crossword Genius

Perennial scheme which involves cycling (3,5)

Ross

I believe the answer is:

hat plant

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

'involves cycling' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'perennial scheme' is the wordplay.
'perennial' becomes 'hat' (I can't explain this - if you can you should believe this answer much more).
'scheme' becomes 'plant' (plant is a kind of scheme).
'hat'+'plant'='HAT-PLANT'

'which' is the link.

Can you help me to learn more?

I've seen this clue in The Independent.
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