Skim the surface? (5)
I believe the answer is:
skate
'skim the surface?' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for skate that I've seen before include "Ice --; roller --" , "Runner" , "Fish of ray family" , "Recite Keats badly to the fish" , "Large, edible rays" .)