Like the setting sun, if you look west (3)

I believe the answer is:

low

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'like the setting sun if' is the definition.
I can't tell whether this definition defines the answer.

'look west' is the wordplay.
'look' becomes 'lo' (archaic exclamation meaning 'look!').
'west' becomes 'W' (abbreviation).
'lo'+'w'='LOW'

'you' acts as a link.

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(Other definitions for low that I've seen before include "Depressed or base" , "Moo; not high" , "Dejected; moo" , "Unimportant sort of owl" , "sound from Hereford?" .)

I've seen this clue in the Evening Standard.

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