To do so gets Alfie no end upset! (4)

I believe the answer is:

fail

I'm a little stuck... Click here to teach me more about this clue!

'to do so' is the definition.
I can't tell whether this definition defines the answer.

'alfie no end upset' is the wordplay.
'no end' means to remove the last letter.
'upset' indicates an anagram.
'alfie' with its last letter taken off is 'alfi'.
'alfi' with letters rearranged gives 'FAIL'.

'gets' acts as a link.

Can you help me to learn more?

(Other definitions for fail that I've seen before include "Run out; flop" , "Don't succeed" , "Break down" , "Be unable to achieve one's object" , "Fall short" .)

I've seen this clue in the Evening Standard.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.