In Dallas, Carol dated sailor (6)
I believe the answer is:
lascar
'sailor' is the definition.
(lascar is a kind of sailor)
'in dallas carol dated' is the wordplay.
'in' indicates a hidden word.
'LASCAR' can be found hidden inside 'dallas carol dated'.
(Other definitions for lascar that I've seen before include "Asian sailor" , "Sailor from overseas" , "Camp-follower" , "E. Indian seaman" , "Eastern sailor" .)