Tempt man not opening with diamonds (6)
I believe the answer is:
entice
'tempt man' is the definition.
'entice' can be an answer for 'tempt' ('entice' can be a synonym of 'tempt'). I am not sure about the 'man' bit.
'not opening with diamonds' is the wordplay.
'not opening' becomes 'ent' (I can't explain this - if you can you should believe this answer much more).
'with' is a charade indicator (letters next to each other).
'diamonds' becomes 'ice' (I've seen this before).
'ent'+'ice'='ENTICE'
Can you help me to learn more?
(Other definitions for entice that I've seen before include "alluring" , "Tempt with promises of reward" , "draw" , "how siren might operate?" , "Tempt, lead astray" .)