Crossword Genius

Fine base -- yours years ago (5)

Ross

I believe the answer is:

thine

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'yours years ago' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'fine base' is the wordplay.
'fine' becomes 'thin' ('thin' can be similar in meaning to 'fine').
'base' becomes 'e' (I've seen this in other clues).
'thin'+'e'='THINE'

Can you help me to learn more?

(Another definition for thine that I've seen is " Yours (archaic)".)

I've seen this clue in The Telegraph.
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