There aren't many in a cafe, washing up (3)
I believe the answer is:
few
'there aren't many' is the definition.
I can't tell whether this definition defines the answer.
'in a cafe washing up' is the wordplay.
'in' indicates the answer is hidden within the clue.
'FEW' is hidden within 'cafe washing up'.
Can you help me to learn more?
(Other definitions for few that I've seen before include "Only one or two" , "Not many, just a handful" , "'''Many are called but ... are chosen'' (Bible) (3)'" , "Considerable number, ironically" , "Hardly anyone" .)