Crossword Genius

A Firth the army may go round for nothing (5)

Ross

I believe the answer is:

moray

I'm a little stuck... Click here to teach me more about this clue!

'a firth' is the definition.
(I've seen this before)

'army may go round for nothing' is the wordplay.
I cannot really see how this works, but
'go' could be 'ray' (raying is a kind of going) and 'ray' is found in the answer.
'round' could be 'o' (round can mean a round object) and 'o' is present in the answer.
A single letter 'm' remains which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

'the' acts as a link.

Can you help me to learn more?

(Other definitions for moray that I've seen before include "Predator eel" , "is fishy" , "Firth" , "One fish" , "seen snaking near the coast?" .)

I've seen this clue in the Evening Standard.
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