Sound blokes making an appearance (5)
I believe the answer is:
guise
'an appearance' is the definition.
(guise is a kind of appearance)
'sound blokes' is the wordplay.
'sound' indicates a 'sounds like' (homophone) clue.
'blokes' becomes 'guys' (I've seen this before).
'guys' is a homophone of 'GUISE'.
'making' is the link.
(Other definitions for guise that I've seen before include "Semblance; likeness" , "Appearance, semblance" , "General appearance" , "Shape; pretence" , "Mask" .)