Crossword Genius

Where climbers go on horseback with notices about river (7)

Ross

I believe the answer is:

upwards

'where climbers go' is the definition.

'on horseback with notices about river' is the wordplay.
'on horseback' becomes 'up' (up can mean up on a horse).
'with' becomes 'w' (abbreviation).
'notices' becomes 'ads' (advertisements).
'about' means one lot of letters goes inside another.
'river' becomes 'r' (abbreviation for river).
'ads' going around 'r' is 'ards'.
'up'+'w'+'ards'='UPWARDS'

(Other definitions for upwards that I've seen before include "in direction of ceiling" , "To a higher position" , "Towards a higher level" .)

I've seen this clue in The Guardian.
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