Move on board by that woman returning around Silver River (11)

'returning around silver river' is the definition.
The definition suggests a singular noun which matches the answer.

'move on board by that woman' is the wordplay.
I cannot really see how this works, but
'move' could be 'castle' (castling is a kind of moving) and 'castle' is present in the answer.
'on' could be 're' ('on' can be mean 'with reference to') and 're' is located in the answer.
'woman' could be 'ag' and 'ag' is located in the answer.
A single letter 'h' remains which might be clued in a way I don't understand.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?