Sailor finds two men unusual (8)
I believe the answer is:
abnormal
'unusual' is the definition.
(similar in meaning)
'sailor finds two men' is the wordplay.
'sailor' becomes 'ab' (abbreviation for able seaman).
'finds' says to put letters next to each other.
'two men' becomes 'normal' (I am not sure about this - if you are sure you should believe this answer much more).
'ab'+'normal'='ABNORMAL'
Can you help me to learn more?
(Other definitions for abnormal that I've seen before include "Deviant, different from the usual" , "Extraordinary" , "Unorthodox" , "'Aberrant, atypical (8)'" , "Different to what is ordinary or expected" .)