Provides an example of unhealthy, primarily unfair street prices (11)

I believe the answer is:

illustrates

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'provides an example' is the definition.
I can't judge whether this definition defines the answer.

'unhealthy primarily unfair street prices' is the wordplay.
'unhealthy' becomes 'i'll' (associated in meaning).
'primarily' suggests taking the first letters.
'street' becomes 'st' (abbreviation).
'prices' becomes 'rates' (I've seen this in another clue).
The initial letter of 'unfair' is 'u'.
'ill'+'u'+'st'+'rates'='ILLUSTRATES'

'of' is the link.

Can you help me to learn more?

(Another definition for illustrates that I've seen is " Shows b".)

I've seen this clue in The Irish Times.

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