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Then cracked up at the fart (5,4)

Ross

I believe the answer is:

after that

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'then' is the definition.
(synonyms)

'up at the fart' is the wordplay.
'up' indicates an anagram (letters get chucked up).
'at'+'the'+'fart'='atthefart'
'atthefart' is an anagram of 'AFTER THAT'.

'cracked' is the link.
This may not be right. It may belong to another bit of the clue.

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I've seen this clue in The Guardian.
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