Old fogey? (6)
(Other definitions for fossil that I've seen before include "Fuddy-duddy" , "Lasting impression" , "Petrified 9" , "Ancient remnant hardened in rock" , "Prehistoric relic" .)
'old fogey' is the definition.
(both can mean an old-fashioned person)
This is all the clue.
(Other definitions for dinosaur that I've seen before include "Reptile is around, not really" , "type unable to adapt" , "Extinct terrestrial reptile" , "Beast long gone" , "Prehistoric monster from Jurassic era" .)