With whom Alan tours Birkenhead (5)

I believe the answer is:

alban

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'with whom' is the definition.
I can't judge whether this defines the answer.

'alan tours birkenhead' is the wordplay.
'tours' is an insertion indicator (to tour can mean to go around).
'birkenhead' becomes 'b' (head letter of 'birken').
'alan' enclosing 'b' is 'ALBAN'.

Can you help me to learn more?

(Other definitions for alban that I've seen before include "Hertfordshire saint" , "Saint born at Verulamium" , "-- Berg, composer" , "First English Christian martyr" , "First British martyr, supposedly born in Verulamium" .)

I've seen this clue in the Evening Standard.

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