Highlight what PA would ask boss to do before email? (8)
I believe the answer is:
signpost
'highlight' is the definition.
(both can mean to draw attention to something)
'what pa would ask boss to do before email?' is the wordplay.
'what pa would ask boss to do' becomes 'sign' (a PA might ask their boss to sign something).
'before' means one lot of letters go next to another.
'email?' becomes 'post' (email is a type of post or mail).
'sign'+'post'='SIGNPOST'
(Other definitions for signpost that I've seen before include "It shows the way" , "Direction indicator" , "Route indicator" , "pointer along the way" , "Direction pointer" .)