Initially, vehicle indicates before right turn, seeing sign (5)
I believe the answer is:
virgo
'sign' is the definition.
(Virgo is an example)
'initially vehicle indicates before right turn' is the wordplay.
'initially' indicates taking the first letters.
'before' means one lot of letters go next to another.
'right' becomes 'r' (common abbreviation).
'turn' becomes 'go' (a person's move in a board game**).
The initial letters of 'vehicle indicates' is 'vi'.
'vi'+'r'+'go'='VIRGO'
'seeing' acts as a link.
(Other definitions for virgo that I've seen before include "Star sign" , "number of stars" , "Large constellation between Leo and Libra" , "House" , "Sixth sign of zodiac" .)