Social crawlers upset by Stan (4)

I believe the answer is:

ants

'social crawlers' is the definition.
(I've seen this in another clue)

'upset by stan' is the wordplay.
'upset by' indicates anagramming the letters.
'stan' with letters rearranged gives 'ANTS'.

(Other definitions for ants that I've seen before include "Termites" , "Hard workers" , "Small social insects" , "They live in a formicary" , "Tiny insects that live in colonies" .)

I've seen this clue in the Evening Standard.

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