Borders of world full of spirit (7)

I believe the answer is:

margins

'borders' is the definition.
(I know this)

'world full of spirit' is the wordplay.
'world' becomes 'mars' (I've seen this before).
'full of' means one lot of letters goes inside another.
'spirit' becomes 'gin' (alcoholic spirit).
'mars' enclosing 'gin' is 'MARGINS'.

'of' acts as a link.

(Another definition for margins that I've seen is " Profits".)

I've seen this clue in The Telegraph.

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