Crossword Genius

Set against a ledge, wobbling (9)

Ross

I believe the answer is:

congealed

'set' is the definition.

'against a ledge wobbling' is the wordplay.
'against' becomes 'con' (I've seen this before**).
'wobbling' indicates anagramming the letters.
'a'+'ledge'='aledge'
'aledge' with letters rearranged gives 'gealed'.
'con'+'gealed'='CONGEALED'

(Another definition for congealed that I've seen is " curdled".)

I've seen this clue in The Telegraph.
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