Present and former US president in English city (8)
I believe the answer is:
hereford
'english city' is the definition.
(I've seen this before)
'present and former us president' is the wordplay.
'present' becomes 'here' (both can mean in attendance).
'and' means one lot of letters go next to another.
'former us president' becomes 'ford' (I am not sure about this - if you are sure you should believe this answer much more).
'here'+'ford'='HEREFORD'
'in' is the link.
Can you help me to learn more?
(Other definitions for hereford that I've seen before include "Place" , "cow!)" , "cross breed of cattle" , "City on the River Wye - cattle breed" , "English cathedral city" .)