Spanish islander with serious means of preservation (8)

I believe the answer is:

majorcan

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'spanish islander' is the definition.
'majorcan' can be an answer for 'islander' (I've seen this before). I'm not certain of the 'spanish' bit.

'with serious means of preservation' is the wordplay.
'with' says to put letters next to each other.
'serious' becomes 'major' (I've seen this in another clue).
'means of preservation' becomes 'can' (I can't justify this - if you can you should believe this answer much more).
'major'+'can' is 'MAJORCAN'.

Can you help me to learn more?

(Other definitions for majorcan that I've seen before include "Man from Palma" , "islander" .)

I've seen this clue in The Irish Times.

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