One in suit turns up, lest adversary leads in count? (7)
I believe the answer is:
dracula
'count?' is the definition.
(Count Dracula)
'one in suit turns up lest adversary leads' is the wordplay.
'one in suit turns' becomes 'drac' (I can't explain this - if you can you should believe this answer much more).
'leads' says to take the initial letters.
The initial letters of 'up lest adversary' is 'ula'.
'drac'+'ula'='DRACULA'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for dracula that I've seen before include "gothic novel" , "Stoker's Count" , "Vampire Count (Stoker)" , "Bram Stoker's gothic vampire" , "Famous vampire" .)