Tempting one to start lunch with a wry grin (6)
I believe the answer is:
luring
'tempting' is the definition.
('lure' can be a synonym of 'tempt')
'one to start lunch with a wry grin' is the wordplay.
'one to start lunch with' becomes 'lu' (I can't explain this - if you can you should believe this answer much more).
'a wry' indicates an anagram (wry can mean twisted or distorted).
'grin' anagrammed gives 'ring'.
'lu'+'ring'='LURING'
Can you help me to learn more?
(Another definition for luring that I've seen is " Enticing, tempting".)