Bachelor's last words, popularly, in an artificial language? (3)
I believe the answer is:
ido
'artificial language?' is the definition.
(Ido is an example)
'bachelor's last words popularly in an' is the wordplay.
I cannot quite see how this works, but
'an' could be 'i' (Roman numeral for one) and 'i' is located in the answer.
The remaining letters 'do' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
(Other definitions for ido that I've seen before include "Say yes in marriage" , "International language" , "Wedding response" , "Prepared tongue" , "Naturally, nobody speaks this" .)