Trying person in party may be doing so (6,1,4)

I believe the answer is:

having a bash

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

'trying' is the definition.
(to have a bash at something is to try it)

'person in party may be doing so' is the wordplay.
I cannot quite understand how this works, but
'in' is present in the answer.
'party' could be 'bash' (term for a party or celebration) and 'bash' is present in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Guardian.

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.