Palace attendant has no time for messenger (7)
I believe the answer is:
courier
'for messenger' is the definition.
(synonyms)
'palace attendant has no time' is the wordplay.
'palace attendant' becomes 'courtier' (I've seen this in another clue).
'has no' suggests deleting specific letters.
'time' becomes 't' (abbreviation).
'courtier' with 't' removed is 'COURIER'.
(Other definitions for courier that I've seen before include "Person delivering a parcel, say, by motorcycle" , "Dispatch rider" , "guide for tourists" , "Tourist guide" , "Messenger, often on a motorbike" .)