Job for a messenger or a clever darner (6)

I believe the answer is:

errand

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'job' is the definition.
(thesaurus)

'clever darner' is the wordplay.
'clever' indicates anagramming the letters.
'darner' is an anagram of 'ERRAND'.

'for a messenger or a' is the link.
This may not be right. Some or all of it may belong to another bit of the clue.

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(Other definitions for errand that I've seen before include "Journey made on someone else's behalf" , "In purposeful trip" , "Mission usually for others" , "Task involving trip" , "A little job" .)

I've seen this clue in the Evening Standard.

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