Time-waster ultimately agreed to go to France without one (7)

'time-waster' is the definition.
I can't judge whether this defines the answer.

'ultimately agreed to go to france without one' is the wordplay.
'ultimately' indicates one should take the final letters.
'to go to' says to put letters next to each other.
'france' becomes 'aller' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'without' is an insertion indicator ('without' can be similar in meaning to 'outside').
'one' becomes 'i' (Roman numeral).
The last letter of 'agreed' is 'd'.
'aller' placed around 'i' is 'allier'.
'd'+'allier'='DALLIER'

Can you help me to learn more?