An old letter from Goethe (3)

I believe the answer is:

eth

'an old letter' is the definition.
(eth was an Old English letter)

'from goethe' is the wordplay.
'from' says the answer is hidden in the clue.
'ETH' can be found hidden inside 'goethe'.

(Other definitions for eth that I've seen before include "18's fiance" , "Old letter; the (anag.)" , "girl" , "Little Ethel" , "Old English letter" .)

I've seen this clue in The Guardian.

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