Communications from boss Liam examines on way up (6)
I believe the answer is:
emails
'communications' is the definition.
(email is a kind of communication)
'from boss liam examines on way up' is the wordplay.
'from' indicates a hidden word.
'on way up' shows that the letters should be reversed in order.
'sliame' can be found hidden inside 'boss liam examines'.
'sliame' written backwards gives 'EMAILS'.
(Other definitions for emails that I've seen before include "Electronic communications" , "Electronic messages" , "Computer communications" .)