Crow that is revealing new recruit (6)
I believe the answer is:
rookie
'new recruit' is the definition.
(a rookie is a new recruit or trainee)
'crow that is' is the wordplay.
'crow' becomes 'rook' (I've seen this in another clue).
'that is' becomes 'ie' (short for Latin 'id est', 'that is').
'rook'+'ie'='ROOKIE'
'revealing' is the link.
(Other definitions for rookie that I've seen before include "New recruit as to army" , "Novice" , "new team member" , "untrained soldier" , "Raw recruit" .)