Dish was for lad prepared by another (7,5)

I believe the answer is:

waldorf salad

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'dish' is the definition.
(Waldorf salad is an example)

'was for lad prepared by another' is the wordplay.
'prepared' is an anagram indicator.
'by another' becomes 'lad' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'was'+'for'+'lad'='wasforlad'
'wasforlad' anagrammed gives 'waldorfsa'.
'waldorfsa'+'lad'='WALDORF SALAD'

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(Other definitions for waldorf salad that I've seen before include "Vegetarian dish of celery, apples, walnuts and mayonnaise" , "Apples, celery, walnuts and mayo" , "eats" , "Mix of apples, walnuts, celery, etc" .)

I've seen this clue in The Times.

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