Crossword Genius

Surrender the right to indicate short method (4,4)

Ross

I believe the answer is:

sign away

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'surrender' is the definition.
(I know that sign away is a more specific form of the action surrender)

'right to indicate short method' is the wordplay.
'right' becomes 'na' (I can't explain this - if you can you should give a lot more credence to this answer).
'to' is a charade indicator (letters next to each other) (I've seen this in other clues).
'indicate' becomes 'sign' (I've seen this in other clues).
'short' means to remove the last letter.
'method' becomes 'way' (way of doing something).
'sign' with its last letter taken away is 'sig'.
'na' put after 'sig' is 'signa'.
'signa'+'way'='SIGN AWAY'

'the' is the link.

Can you help me to learn more?

(Other definitions for sign away that I've seen before include "Relinquish in writing" , "Dispense with" .)

I've seen this clue in The Independent.
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