Crossword Genius

Finally sag — not tall — crumbling (2,4,4)

Ross

I believe the answer is:

at long last

'finally' is the definition.
(synonyms)

'sag not tall crumbling' is the wordplay.
'crumbling' is an anagram indicator.
'sag'+'not'+'tall'='sagnottall'
'sagnottall' is an anagram of 'AT LONG LAST'.

(Other definitions for at long last that I've seen before include "Finally" , "After much delay" , "producing larger shoes?" , "cobbling size seventeens?" , "Eventually" .)

I've seen this clue in The Everyman puzzle in The Observer.
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