Made it clear the wheel had a part missing (5,3)

I believe the answer is:

spoke out

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'made it clear the wheel' is the definition.
I know nothing about this answer so I can't judge whether this works.

'a part missing' is the wordplay.
'a part' becomes 'spoke' (I can't justify this - if you can you should give a lot more credence to this answer).
'missing' becomes 'out' (I've seen this in another clue).
'spoke'+'out'='SPOKE OUT'

'had' is the link.

Can you help me to learn more?

I've seen this clue in the Evening Standard.

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