Hotel on old TV show half-heartedly served up this? (7,5)
I believe the answer is:
waldorf salad
'tv show half-heartedly served up this?' is the definition.
The definition suggests a singular noun which matches the answer.
'hotel on old' is the wordplay.
I cannot really see how this works, but
an anagram of 'old' is 'ldo' which is located in the answer.
This may be the basis of clue (or it may be nonsense).
(Other definitions for waldorf salad that I've seen before include "Apples, celery, walnuts and mayo" , "Mix of apples, walnuts, celery, etc" , "Vegetarian dish of celery, apples, walnuts and mayonnaise" , "eats" .)