Left TV programme, missing the forecast of good weather (3,3,2,5)
I believe the answer is:
red sky at night
'forecast of good weather' is the definition.
('red sky at night, shepherd's delight')
'left tv programme missing the' is the wordplay.
I cannot really see how this works, but
'left' could be 'nigh' (similar in meaning) and 'nigh' is located in the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is found within the answer.
This may be the basis of the clue (or it may be nonsense).
(Other definitions for red sky at night that I've seen before include "sign of good things on the morrow?" , "Shepherd's delight" .)