Everyone repeat, inking in identical initials? (10)
I believe the answer is:
alliterate
'in identical initials?' is the definition.
(alliterate can mean 'with alliteration')
'everyone repeat' is the wordplay.
'everyone' becomes 'all' (I've seen this before).
'repeat' becomes 'iterate' (synonyms).
'all'+'iterate'='ALLITERATE'
'inking' acts as a link.
(Other definitions for alliterate that I've seen before include "say bollocks to Brexit?" , "put with a lot of bees?" .)