Crossword Genius

Flat surface’s length, on the side? (5)

Ross

I believe the answer is:

ledge

'flat surface's' is the definition.
(eg a window ledge)

'length on the side?' is the wordplay.
'length' becomes 'l' (abbreviation in geometry).
'on' says to put letters next to each other.
'the side?' becomes 'edge' (edge is a kind of side).
'l'+'edge'='LEDGE'

(Other definitions for ledge that I've seen before include "Mantelpiece" , "Narrow projecting shelf as from window" , "Projecting shelf, horizontal projection" , "Rock shelf" , "rocky situation?" .)

I've seen this clue in The Times.
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