Crossword Genius

Second promise for fencing material? (5)

Ross

I believe the answer is:

sword

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'fencing material?' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe you can see a link between them that I can't see?

'second promise' is the wordplay.
'second' becomes 's' (common abbreviation).
'promise' becomes 'word' (as in 'I give you my word').
's'+'word'='SWORD'

'for' is the link.

Can you help me to learn more?

(Other definitions for sword that I've seen before include "Normandy beach" , "Combat" , "used for fencing" , "Weapon of steel" , "Weapon with long blade" .)

I've seen this clue in the Sydney Morning Herald.
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