Card for sailor to turn over? (5)
I believe the answer is:
tarot
'card' is the definition.
(tarot cards are used to tell fortunes)
'sailor to turn over?' is the wordplay.
'sailor' becomes 'tar' (slang term for a sailor).
'turn over?' shows that the letters should be reversed in order (I've seen 'turn over' mean this).
'to' reversed gives 'ot'.
'tar'+'ot'='TAROT'
'for' is the link.
(Other definitions for tarot that I've seen before include "Cards often used in fortune-telling" , "Special cards for fortune-telling" , "Picture card" , "Fortune teller" , "Fortune-teller's card" .)