Crossword Genius

Mormon's end by salt lake (4)

Ross

I believe the answer is:

tarn

'lake' is the definition.
(I know that tarn is a type of lake)

'mormon's end by salt' is the wordplay.
'end' suggests the final letters.
'by' is a charade indicator (letters next to each other).
'salt' becomes 'tar' (both can informally mean a sailor).
The final letter of 'mormon' is 'n'.
'n' put after 'tar' is 'TARN'.

(Other definitions for tarn that I've seen before include "Scottish mountain lake" , "Mountain pool: French department" , "Small mountain lake" , "High water" .)

I've seen this clue in The Guardian.
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