Entertaining girl during voyage is hard (6)
I believe the answer is:
geisha
'entertaining girl' is the definition.
(I've seen this before)
'during voyage is hard' is the wordplay.
'during' indicates a hidden word.
'GEISHA' is hidden in the letters of 'voyage is hard'.
(Other definitions for geisha that I've seen before include "Hostess in a kimono" , "Female escort" , "Traditional Japanese female entertainer of men" , "Japanese hostess trained to entertain men" , "Professional female companion for Japanese men" .)