Unmarried man excited Chloe in pub (8)
I believe the answer is:
bachelor
'unmarried man' is the definition.
('bachelor' can be a synonym of 'unmarried man')
'excited chloe in pub' is the wordplay.
'excited' is an anagram indicator.
'in' is an insertion indicator.
'pub' becomes 'bar' (I've seen this before).
'chloe' with letters rearranged gives 'chelo'.
'chelo' placed inside 'bar' is 'BACHELOR'.
(Other definitions for bachelor that I've seen before include "Single man" , "Non-married male" , "Graduate" , "he has no ties" , "Unmarried person" .)