Father raised a traveller's document (5)
I believe the answer is:
paper
'document' is the definition.
(e.g. scientific paper, white paper)
'father raised a traveller's' is the wordplay.
'father' becomes 'pa' (pa can mean dad or father).
'raised' is a reversal indicator (going up in a down clue).
'a traveller' becomes 'rep' (travel company worker).
'rep' reversed gives 'per'.
'pa'+'per'='PAPER'
(Other definitions for paper that I've seen before include "Set of examination questions" , "Literary essay" , "Writing sheet(s)?" , "Daily publication" , "It's usually made from wood pulp" .)