Most of military unit speak on a collective basis (9)
I believe the answer is:
corporate
'most of military unit speak on a collective basis' is the definition.
I can't tell whether this definition defines the answer.
'most of military unit speak on' is the wordplay.
'most of' means to remove the last letter.
'military unit' becomes 'corps' (corps is a kind of military unit).
'speak' becomes 'orate' (orating is a kind of speaking).
'on' means one lot of letters go next to another.
'corps' with its final letter taken away is 'corp'.
'corp'+'orate'='CORPORATE'
Can you help me to learn more?
(Other definitions for corporate that I've seen before include "Of a legal entity acting as an individual" , "Poor crate could be legally united into a body" , "belonging to a large company" , "Relating to a large group; united" , "Relating to a large group or company" .)