Seafront as well as beach (4)
I believe the answer is:
sand
'beach' is the definition.
'seafront as well' is the wordplay.
'seafront' becomes 's' (this might be a standard abbreviation which I don't know about).
'as well' becomes 'and' (I've seen this in other clues).
's'+'and'='SAND'
'as' acts as a link.
Can you help me to learn more?
(Other definitions for sand that I've seen before include "Result of rock erosion" , "Fine grit" , "Beach grit" , "Smooth with abrasive paper" , "Beach susbstance" .)