Two-sided supermajor engaging one craftsman (10)

I believe the answer is:

bipartisan

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

'two-sided' is the definition.
(I've seen this in another clue)

'supermajor engaging one craftsman' is the wordplay.
'supermajor' becomes 'bp' (I can't explain this - if you can you should believe this answer much more).
'engaging' is an insertion indicator.
'one' becomes 'I' (Roman numeral).
'craftsman' becomes 'artisan' (synonyms).
'bp' enclosing 'i' is 'bip'.
'bip'+'artisan'='BIPARTISAN'

Can you help me to learn more?

(Other definitions for bipartisan that I've seen before include "Associated with two parties" , "Supported by both sides - aspirin tab (anag)" , "As is cooperation between two parties" , "Like a coalition government" , "supported by two political parties!" .)

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.