Stylish man in yellow (7)
I believe the answer is:
chicken
'yellow' is the definition.
(as in cowardly)
'stylish man' is the wordplay.
'stylish' becomes 'chic' (similar in meaning).
'man' becomes 'ken' (short for Kenneth).
'chic'+'ken'='CHICKEN'
'in' acts as a link.
(Other definitions for chicken that I've seen before include "Domestic bird - frightened" , "(Yellow?) bird" , "In check (anag.)" , "Proverbial road-crosser" , "Informally cowardly like domestic fowl" .)