Crossword Genius

Looking up, see heights (4)

Ross

I believe the answer is:

tops

'heights' is the definition.
('top' can be a synonym of 'height')

'looking up see' is the wordplay.
'looking up' says the letters should be written in reverse (in a down clue, letters go up).
'see' becomes 'spot' (to spot is to notice or catch sight of).
'spot' back-to-front is 'TOPS'.

(Other definitions for tops that I've seen before include "Betters" , "The best" , "Goes beyond" , "Max - spinning toys" , "Does better" .)

I've seen this clue in The Guardian.
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