Order, for example, thus (3-2)
I believe the answer is:
say-so
'order' is the definition.
(I've seen this before)
'for example thus' is the wordplay.
'for example' becomes 'say' ('say' can be used to introduce an example).
'thus' becomes 'so' (synonyms).
'say'+'so'='SAY-SO'
(Other definitions for say-so that I've seen before include "Mere assertion (colloq.)" , "Authority to make a decision" , "Go-ahead" , "Final authority" , "Authority - rumour" .)