Senseless sort of deer are sequentially coded (8)
I believe the answer is:
numbered
'sequentially coded' is the definition.
The definition and answer can be both to do with communicating as well as being past participle verbs.
Perhaps there's an association between them I don't understand?
'senseless sort of deer' is the wordplay.
'senseless' becomes 'numb' (I've seen this in another clue).
'sort of' is an anagram indicator.
'deer' is an anagram of 'ered'.
'numb'+'ered'='NUMBERED'
'are' is the link.
Can you help me to learn more?
(Other definitions for numbered that I've seen before include "Assigned a numeral" , "If one's days are ........, there's not long to live" , "Designated" , "Counted" , "One whose days are ... has not long to live" .)