Two Poles about to come up with nothing? Untrue (3,2)
I believe the answer is:
not so
'untrue' is the definition.
(I've seen this before)
'two poles about to come up with nothing?' is the wordplay.
'two poles' becomes 'sn'.
'about' means one lot of letters goes inside another.
'come up' shows that the letters should be reversed in order.
'with' says to put letters next to each other.
'nothing?' becomes 'o' (looks like zero - 0).
'sn' going around 'to' is 'ston'.
'ston' backwards is 'nots'.
'nots'+'o'='NOT SO'
(Other definitions for not so that I've seen before include "untrue" , "Wrong" , "Less" .)