Tailor is good listener (4)
I believe the answer is:
gear
'tailor' is the definition.
(thesaurus)
'good listener' is the wordplay.
'good' becomes 'g' (abbreviation).
'listener' becomes 'ear' (body part which hears or listens).
'g'+'ear'='GEAR'
'is' is the link.
(Other definitions for gear that I've seen before include "Toothed wheel which engages with another one" , "Toothed wheel used when changing speed" , "Outfit - equipment - changed on inclination?" , "Equipment; car mechanism" , "Informal clothes seen in rage" .)