Crossword Genius

Not the senior service, but it goes far back (3)

Ross

I believe the answer is:

raf

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

'not the senior service but it' is the definition.
I can't judge whether this definition defines the answer.

'far back' is the wordplay.
'back' says the letters should be written backwards.
'far' written backwards gives 'RAF'.

'goes' acts as a link.

Can you help me to learn more?

(Other definitions for raf that I've seen before include "It fought Battle of Britain" , "Airforce of Great Britain" , "Royal Air Force (abbr.)" .)

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