You won't see many in a cafe window (3)
I believe the answer is:
few
'you won't see many' is the definition.
I can't judge whether this definition defines the answer.
'in a cafe window' is the wordplay.
'in' indicates a hidden word.
'FEW' is hidden within 'cafe window'.
Can you help me to learn more?
(Other definitions for few that I've seen before include "Hardly anyone" , "Considerable number, ironically" , "Relatively small number" , "Not many, just a handful" , "Indefinite but small number" .)