Enjoyed this as always Jolan. Despite the illness these were tough as always. Get well soon.
My guesses are as follows. Number one I’m not confident about.
1. Writer for a little one’s amusement? (7) PLAYPEN - a cryptic pun ? Thought Tolstoy at first but it didn't work so hopefully this is right.
2. Position for every inhabitant or outsider (9) LAYPERSON- DEF-outsider. Position ( lay) for every (per ) +( son) inhabitant
3. The authority of an ancient British chief to hem in and haul aboard (13) PENDRAGONSHIP -authority of ancient British chief. Pen (hem in) + Drag on ship (haul aboard)
4. Enemies and reserves return with painted weapons? (2,7,5) AT DAGGERS DRAWN- enemies. Reserves- TA backwards or AT painted weapons- are ‘daggers drawn’
5. Two knights united at heart by criminal sister's condition? (7) NUNHOOD- sister’s condition. N is knight U is United- N U N (2 knights with U ‘at heart’) + Hood (criminal)