Husband leading a pair of judges in pilgrimage (4)
I believe the answer is:
hajj
'pilgrimage' is the definition.
(Islamic pilgrimage to Mecca)
'husband leading a pair of judges' is the wordplay.
'leading' says to take the initial letters.
'pair of judges' becomes 'jj' (I am not sure about this - if you are sure you should believe this answer much more).
The initial letter of 'husband' is 'h'.
'h'+'a'+'jj'='HAJJ'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for hajj that I've seen before include "pilgrimage"" , "religious journey" .)