Press refuse to turn up (4)
I believe the answer is:
cram
'press' is the definition.
(thesaurus)
'refuse to turn up' is the wordplay.
'refuse' becomes 'marc' (discarded material in winemaking).
'to turn up' is a reversal indicator.
'marc' in reverse letter order is 'CRAM'.
(Other definitions for cram that I've seen before include "Pack in or study hard" , "Study intensively" , "Press together" , "A crush" , "Stuff (facts for exam)" .)