O'Reilly's header follows short corner from England (5)

'england' is the definition.
Both the definition and answer are singular nouns.
Maybe they are linked in a way I don't understand?

'o'reilly's header follows short corner' is the wordplay.
'header' indicates taking the first letters (in a down clue, the letter at the top of the word).
'follows' is a charade indicator (letters next to each other).
'short' means to remove the last letter.
'corner' becomes 'angle' (eg a corner of a shape).
The first letter of 'oreilly' is 'o'.
'angle' with its final letter taken away is 'angl'.
'o' put after 'angl' is 'ANGLO'.

'from' is the link.

Can you help me to learn more?