Seek dull job with hospital doing longest possible shift in fabrication (7)
I believe the answer is:
untruth
'fabrication' is the definition.
(thesaurus)
'seek dull job with hospital doing longest possible shift' is the wordplay.
I cannot really see how this works, but
'hospital' could be 'h' (abbreviation for hospital on maps) and 'h' is found within the answer.
'dull job' could be 'rut' (being stuck in a rut is being stuck in a dull rout) and 'rut' is found within the answer.
This explanation may well be incorrect...
'in' is the link.
(Other definitions for untruth that I've seen before include "Fiction" , "product of Orwell's ministry?" , "A lie or false statement" , "story" , "Falsehood or lie" .)