A fighter’s only friend (5)

I believe the answer is:

amigo

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

'a fighter's only' is the wordplay.
'fighter' becomes 'mig' (I've seen this in other clues).
'only' becomes 'o' (this could be a standard abbreviation I've not previously seen).
'a'+'mig'+'o'='AMIGO'

Can you help me to learn more?

(Other definitions for amigo that I've seen before include "Pal from Madrid?" , "A Spanish pal" , "Mate in Madrid?" , "Friend from Spain?" , "China (in Spain's view)" .)

I've seen this clue in The Hindu.

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