Follow round a pair of females in ship's bar (8)
I believe the answer is:
taffrail
'ship's bar' is the definition.
(rail around a ship)
'follow round a pair of females' is the wordplay.
'follow' becomes 'trail' (trail can mean to follow in secret).
'round' indicates putting letters inside.
'pair of females' becomes 'FF' (the abbreviation for female repeated).
'a'+'ff'='aff'
'trail' going around 'aff' is 'TAFFRAIL'.
'in' acts as a link.
(Other definitions for taffrail that I've seen before include "Guard on ship" , "Barrier around ship's stern" , "Stern guard" , "bar on deck" , "ship's bar" .)