Revolting chaps last to arrive in bustling terminus (9)

'revolting chaps' is the definition.
(people taking part in a mutiny or revolt)

'last to arrive in bustling terminus' is the wordplay.
'last to' says to take the final letters.
'in' means one lot of letters goes inside another.
'bustling' is an anagram indicator (letters bustle around).
The last letter of 'arrive' is 'e'.
'terminus' is an anagram of 'mutiners'.
'e' placed into 'mutiners' is 'MUTINEERS'.