Report of fellows making an appearance (5)
I believe the answer is:
guise
'an appearance' is the definition.
(guise is a kind of appearance)
'report of fellows' is the wordplay.
'report of' shows a homophone (sound like).
'fellows' becomes 'guys' (I've seen this before).
'guys' sounds like 'GUISE'.
'making' acts as a link.
(Other definitions for guise that I've seen before include "Show" , "General appearance" , "Demeanour" , "Semblance; likeness" , "Appearance, semblance" .)