Crucial ring stolen in exciting pirate movie (10)
I believe the answer is:
imperative
'crucial' is the definition.
(I've seen this before)
'ring stolen in exciting pirate movie' is the wordplay.
I cannot quite see how this works, but
an anagram of 'pirate' is 'perati' which is present in the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for imperative that I've seen before include "Requiring attention" , "Of vital importance, commanding" , "Extremely important" , "Urgent" , "Obligatory" .)