Stylish current paper in the Big Apple (5)
I believe the answer is:
nifty
'stylish' is the definition.
(I've seen this in another clue)
'current paper in the big apple' is the wordplay.
'current' becomes 'I' (symbol for electric current).
'paper' becomes 'ft' (newspaper the FT, Financial Times).
'in' means one lot of letters goes inside another.
'the big apple' becomes 'ny' (short for New York).
'i'+'ft'='ift'
'ift' going inside 'ny' is 'NIFTY'.
(Other definitions for nifty that I've seen before include "Dandy" , "Fine (slang)" , "Smart" , "Really good (slang)" , "Stylish, nimble" .)