Perhaps Pan, in fables, severely upset (6)
I believe the answer is:
vessel
'perhaps pan' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps you can see a link between them that I don't see?
'in fables severely upset' is the wordplay.
'in' indicates a hidden word.
'upset' says the letters should be written backwards.
'lessev' can be found hidden inside 'fables severely'.
'lessev' back-to-front is 'VESSEL'.
Can you help me to learn more?
(Other definitions for vessel that I've seen before include "Ship, or artery" , "Large boat; container" , "Container for liquid or craft for water" , "Ship, or receptacle for liquid" , "Craft for water transportation" .)