Acquiesce when told to go (6)
I believe the answer is:
assent
'acquiesce' is the definition.
(I know that acquiesce can be written as assent)
'when told to go' is the wordplay.
'when' becomes 'as' (eg 'when I walked' means 'as I walked').
'told to go' becomes 'sent' (I've seen this in another clue).
'as'+'sent'='ASSENT'
(Other definitions for assent that I've seen before include "Agreement (to a proposal)" , "Acquiescence" , "Permit or approve" , "Agreement or concurrence" , "Give the thumbs-up" .)