Deny Geordie crowd? (6)
I believe the answer is:
negate
'deny' is the definition.
(negate can mean to deny or refute)
'geordie crowd?' is the wordplay.
'geordie' becomes 'NE' (Geordies are from Tyneside in the North East).
'crowd?' becomes 'gate' (gate can refer to the crowd for a sporting event).
'ne'+'gate'='NEGATE'
(Other definitions for negate that I've seen before include "Deny the truth of" , "Discredit" , "Countermand" , "Cancel; invalidate" , "Make invalid" .)