Be agreeable when shipped out (6)
I believe the answer is:
assent
'be agreeable' is the definition.
(I've seen this in another clue)
'when shipped out' is the wordplay.
'when' becomes 'as' (eg 'when I walked' means 'as I walked').
'shipped out' becomes 'sent' (I've seen this in another clue).
'as'+'sent'='ASSENT'
(Other definitions for assent that I've seen before include "Permit or approve" , "Agreement (to a proposal)" , "Official sanction" , "Compliance, agreement" , "Agreement or concurrence" .)