### Clue: Writing follows us up – in the primary curriculum? (4)
### Answer: SUMS 
 ### Explanation: Definition: Writing follows us up – in the primary curriculum?
<=**US **+ **MS** (manuscript, so "writing") and &lit. 
*Technically, in the traditional three Rs, it's reading, writing & 'rithmetic, so sums follow writing, but that's a minor nuance.