Restaurant employee has red face, lacking good service (4)
I believe the answer is:
chef
'restaurant employee' is the definition.
'red face lacking good service' is the wordplay.
'red' becomes 'che' (Che Guevara the Marxist revolutionary).
'lacking' indicates named letters should be taken away.
'good service' becomes 'ace' (a good serve in tennis).
'face' with 'ace' taken away is 'f'.
'che'+'f'='CHEF'
'has' is the link.
(Other definitions for chef that I've seen before include "Professional cook" , "member of kitchen staff" , "Head cook in a restaurant" , "responsible for courses" , "Cooker?" .)