Crossword Genius

Lower a boat on the lake (5)

Ross

I believe the answer is:

scowl

'lower' is the definition.
(scowling is a kind of lowering)

'a boat on the lake' is the wordplay.
'a boat' becomes 'scow' (scow is a kind of boat).
'on' says to put letters next to each other (in a down clue, letters appear on others).
'the lake' becomes 'L' (geographical abbreviation).
'scow'+'l'='SCOWL'

(Other definitions for scowl that I've seen before include "Angry frown" , "Grimace" , "Glare" , "Glower; frown" , "Bad-tempered expression" .)

I've seen this clue in The Globe and Mail.
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