Farm worker that hurts children with pinches (7)

I believe the answer is:

cowhand

I'm a little stuck... Click here to teach me more about this clue!

'farm worker' is the definition.
'cowhand' can be an answer for 'worker' (cowhand is a kind of worker). I am unsure of the 'farm' bit.

'that hurts children with pinches' is the wordplay.
'that hurts' becomes 'ow!'.
'children' becomes 'ch' (genealogical abbreviation).
'with' becomes 'and'.
'pinches' is an insertion indicator (pinch can mean to steal).
'ch'+'and'='chand'
'ow' put into 'chand' is 'COWHAND'.

Can you help me to learn more?

(Another definition for cowhand that I've seen is " herdsman".)

I've seen this clue in The Independent.

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