Crossword Genius

Theseus oddly appears in English river (4)

Ross

I believe the answer is:

tees

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

'theseus oddly' is the wordplay.
'oddly' means one should take alternating letters (letters in the odd-numbered positions are used).
The alternate letters of 'theseus' are 'TEES'.

'appears in' is the link.

(Other definitions for tees that I've seen before include "Northern river" , "Flower" , "Middlesbrough's river" , "sand-hills" , "English river" .)

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