Make mistake with son, observing several jobs that need doing (7)

I believe the answer is:

errands

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'several jobs that need doing' is the definition.
I can't tell whether this defines the answer.

'make mistake with son' is the wordplay.
'make mistake' becomes 'err' (to err is to make an error).
'with' becomes 'and'.
'son' becomes 's' (genealogical abbreviation for son).
'err'+'and'+'s'='ERRANDS'

'observing' acts as a link.

Can you help me to learn more?

(Other definitions for errands that I've seen before include "charges" , "Odd jobs" , "Small jobs" , "Task-oriented trips" , "Short trips to perform commissions" .)

I've seen this clue in The Irish Times.

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