Intermittently flaunt gold front tooth (4)
I believe the answer is:
fang
'tooth' is the definition.
(fang is a kind of tooth)
'intermittently flaunt gold front' is the wordplay.
'intermittently' means one should take alternating letters.
'front' says to take the initial letters.
The initial letter of 'gold' is 'g'.
The alternate letters of 'flaunt' are 'fan'.
'fan'+'g'='FANG'
(Other definitions for fang that I've seen before include "nipper" , "Large canine tooth" , "Dracula's tooth?" , "Long pointed tooth" , "possible poisoner" .)