Crossword Genius

A fishy old weapon (4)

Ross

I believe the answer is:

pike

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This clue could be a double definition.

'a fishy' is the first definition.
(type of fish)

'old weapon' is the second definition.
'pike' can be an answer for 'weapon' (pike is a kind of weapon). I am unsure of the 'old' bit.

Can you help me to learn more?

(Other definitions for pike that I've seen before include "jackknife" , "Former infantry weapon" , "Shafted weapon; diving position" , "See 1 down" , "Fish - old infantry weapon" .)

I've seen this clue in the Evening Standard.
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