One-one will suit him (3)
I believe the answer is:
ian
'will suit him' is the definition.
The definition suggests a singular noun which matches the answer.
'one-one' is the wordplay.
'one' becomes 'i' (Roman numeral).
'one' becomes 'an' (I've seen this in other clues).
'i'+'an'='IAN'
Can you help me to learn more?
(Other definitions for ian that I've seen before include "The familar Dr Paisley" , "... Fleming, author of the Bond books" , "Scottish John" , "Scottish man's name" , "- McEwan, Eng. writer" .)