Trendy soldier's over visiting, notes swinger outside bar (3,4)
I believe the answer is:
inn sign
'swinger outside bar' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.
'trendy soldier's over visiting notes' is the wordplay.
'trendy' becomes 'in'.
'soldier's' becomes 'gi's' (GI can mean a US soldier).
'over' is a reversal indicator.
'visiting' means one lot of letters goes inside another.
'notes' becomes 'nn' (I've seen this in other clues).
'gis' reversed gives 'sig'.
'sig' going within 'nn' is 'nsign'.
'in'+'nsign'='INN SIGN'
Can you help me to learn more?
(Other definitions for inn sign that I've seen before include "one shows identity at pub door" , ""The Bull" perhaps" , "Board showing name of pub" , "One usually outside pub" , "It hangs over pub" .)