Pancake mixture (6)
I believe the answer is:
batter
'pancake mixture' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for batter that I've seen before include "Strike hard repeatedly" , "Treat violently - pancake mix" , "sportsman" , "Hit hard and often, like cooking mixture" , "Cooking mix of flours, eggs and milk" .)