Crossword Genius

A card or essay about England’s capital (4)

Ross

I believe the answer is:

trey

'a card' is the definition.
(trey is a kind of card)

'essay about england's capital' is the wordplay.
'essay' becomes 'try' ('try' can be a synonym of 'essay').
'about' indicates putting letters inside.
'capital' suggests taking the first letters.
The initial letter of 'englands' is 'e'.
'try' placed around 'e' is 'TREY'.

'or' is the link.

(Another definition for trey that I've seen is " Three in cards".)

I've seen this clue in the Evening Standard.
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