Solution for 28 June cryptic crossword clue

Understand the leg-pull and become agitated? (3,3,4,2)

Solution – get the wind up

If you "understand" something, you can be said to "get" it.  "The leg pull" can also be termed as a "wind up".  Both colloquial phrases to mean playing a practical joke on someone.

If you put those 2 things together you get "get the wind up" which is another phrase which means become nervous or agitated.

I find it interesting that 2 versions of "wind" are used here which not only mean completely different things but are pronounced quite differently too.