Break-in he'd orchestrated in part of Merseyside (10)

I believe the answer is:

birkenhead

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'part of merseyside' is the definition.
The definition suggests a singular noun which matches the answer.

'break-in he'd orchestrated' is the wordplay.
'orchestrated' indicates anagramming the letters (arranged, as music).
'break'+'in'+'hed'='breakinhed'
'breakinhed' with letters rearranged gives 'BIRKENHEAD'.

'in' is the link.

Can you help me to learn more?

(Another definition for birkenhead that I've seen is " Port, say".)

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