Crossword Genius

Ascendant team man joining party — one of those having a big bash? (8,4)

Ross

I believe the answer is:

wrecking ball

'one of those having a big bash?' is the definition.
(ball which bashes into a building)

'ascendant team man joining party' is the wordplay.
'ascendant team man' becomes 'wrecking' (I can't explain this - if you can you should believe this answer much more).
'joining' means one lot of letters go next to another.
'party' becomes 'ball' (ball is a kind of party).
'wrecking'+'ball'='WRECKING BALL'

I've seen this clue in The Guardian.
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