Crossword Genius

Going around a lake, my waterproof covering (6)

Ross

I believe the answer is:

galosh

'waterproof covering' is the definition.
(waterproof shoe)

'going around a lake my' is the wordplay.
'going around' means one lot of letters goes inside another.
'lake' becomes 'L' (geographical abbreviation).
'my' becomes 'gosh' (both are expressions of surprise).
'a'+'l'='al'
'al' going into 'gosh' is 'GALOSH'.

(Other definitions for galosh that I've seen before include "Waterproof shoe" , "Waterproof overshoe" , "singular footwear" , "Rubber overshoe" , "Wellington" .)

I've seen this clue in The Times.
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