Pilgrimage site does away with unauthorised imitations (9)

I believe the answer is:

knockoffs

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

'unauthorised imitations' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'pilgrimage site does away with' is the wordplay.
'pilgrimage site' becomes 'knock' (I am not sure about this - if you are sure you should believe this answer much more).
'does away with' becomes 'offs' (I've seen this in another clue).
'knock'+'offs'='KNOCKOFFS'

Can you help me to learn more?

I've seen this clue in The Irish Times.

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