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Knight for one under spell in historical drama (6,5)

Ross

I believe the answer is:

period piece

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'historical drama' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'knight for one under spell' is the wordplay.
'knight for one' becomes 'piece' (knight is a kind of piece).
'under' means one lot of letters go next to another.
'spell' becomes 'period' (I've seen this before**).
'piece' put after 'period' is 'PERIOD PIECE'.

'in' is the link.

Can you help me to learn more?

(Other definitions for period piece that I've seen before include "Something reminiscent of former times" , "Object belonging to a past age" , "Item reminiscent of a past time" , "Item reminiscent of former times" , "old play" .)

I've seen this clue in The Times.
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