Half-hearted meal set to involve last boss of seven? (14)
I believe the answer is:
superintendent
'boss of seven?' is the definition.
'superintendent' can be an answer for 'boss' (thesaurus). I'm not certain of the 'of seven?' bit.
I can't explain the remainder of the clue.
(Other definitions for superintendent that I've seen before include "One who is in charge of an organisation" , "Police rank" , "Overseer; police officer" , "Police chief" , "Senior police officer" .)