Travel document with say reversed face (6)
I believe the answer is:
visage
'face' is the definition.
(visage is a kind of face)
'travel document with say reversed' is the wordplay.
'travel document' becomes 'visa' (I've seen this before).
'with' means one lot of letters go next to another.
'say' becomes 'eg'.
'reversed' says the letters should be written in reverse.
'eg' written backwards gives 'ge'.
'visa'+'ge'='VISAGE'
(Other definitions for visage that I've seen before include "Face, aspect" , "Mug" , "A person's face, countenance" , "Clock" .)