Win audience with small number that we hear might be Grecian (4)
I believe the answer is:
earn
'win audience with small number that' is the definition.
'earn' can be an answer for 'win' (I've seen this before). I'm unsure of the rest of the definition.
'we hear might be grecian' is the wordplay.
'we hear' indicates a 'sounds like' (homophone) clue.
'might be grecian' becomes 'urn' (as in Keats' Ode on a Grecian Urn).
'urn' is a homophone of 'EARN'.
(Other definitions for earn that I've seen before include "Gain (money, reputation, etc)" , "Take home" , "net" , "Get by working" , "Win" .)