Merseyside port good for pirate (7)

I believe the answer is:

bootleg

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'pirate' is the definition.
The answer and definition can be both to do with ownership as well as being verbs in their base form.
Perhaps they are linked in a way I don't understand?

'merseyside port good' is the wordplay.
'merseyside port' becomes 'bootle'.
'good' becomes 'g' (abbreviation).
'bootle'+'g'='BOOTLEG'

'for' acts as a link.

Can you help me to learn more?

(Other definitions for bootleg that I've seen before include "Illegal music recording" , "Illicit (liquor?)" , "Deal in illicit alcohol" , "Illegally made recordings" , "Distributed illegally" .)

I've seen this clue in The Guardian and The Telegraph.

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