Pressure from retired dandy (3)
I believe the answer is:
fop
'dandy' is the definition.
(I know that dandy can be written as fop)
'pressure from retired' is the wordplay.
'pressure' becomes 'p' (abbreviation).
'from' becomes 'of' (of can mean from or belonging to).
'retired' shows that the letters should be reversed in order.
'p'+'of'='pof'
'pof' back-to-front is 'FOP'.
(Other definitions for fop that I've seen before include "Gallant" , "One affected" , "Man excessively concerned with fashion" , "he enjoys the finest dressing" , "Man excessively concerned with his appearance" .)