Period desk, at rear, seen on standard film from 1990s (8,4)
I believe the answer is:
jurassic park
'film from 1990s' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.
'period desk at rear seen on standard' is the wordplay.
'period' becomes 'jurassic' (Jurassic period is an example).
'at rear' indicates one should take the final letters (the letter at the rear or back of the word).
'seen on' says to put letters next to each other.
'standard' becomes 'par' (standard of play in golf).
The last letter of 'desk' is 'k'.
'k' put after 'par' is 'park'.
'jurassic'+'park'='JURASSIC PARK'
Can you help me to learn more?
(Other definitions for jurassic park that I've seen before include "home for E [EXTINCT] creatures - with 25a" , "Dinosaur film" , "Film about dinosaurs" .)