3-2-1 , perhaps TV show suiting cruciverbalists? (9)
I believe the answer is:
countdown
This clue might be a double definition.
'3-2-1' is the first definition.
'tv show suiting cruciverbalists?' is the second definition.
I know that 'tv show' relates to this answer.
'perhaps' is the link.
Can you help me to learn more?
(Other definitions for countdown that I've seen before include "TV quiz show" , "comes to nothing" , "Pre-launch procedure" , "Final timing for launching spacecraft" , "It ends 2, 1, zero" .)