Wait for a new deal and a happy ending (5)
I believe the answer is:
delay
'wait' is the definition.
(I know that wait can be written as delay)
'a new deal and a happy ending' is the wordplay.
'a new' is an anagram indicator.
'and' is a charade indicator (letters next to each other).
'ending' suggests the final letters (the ending of the word).
The last letter of 'happy' is 'y'.
'deal' anagrammed gives 'dela'.
'dela'+'y'='DELAY'
'for' is the link.
(Other definitions for delay that I've seen before include "hold-up of train?" , "Put off; pause" , "Hold-up, time lag" , "Put off until later" , "Linger - slow down - put off" .)