Outspoken in support of the short orderly (10)
I believe the answer is:
forthright
'outspoken' is the definition.
(I know that outspoken can be written as forthright)
'in support of the short orderly' is the wordplay.
'in support of' becomes 'for' (as in being for a particular cause).
'short' means to remove the last letter.
'orderly' becomes 'right' (I can't explain this - if you can you should give a lot more credence to this answer).
'the' with its last letter taken away is 'th'.
'for'+'th'+'right'='FORTHRIGHT'
Can you help me to learn more?
(Other definitions for forthright that I've seen before include "straightforward" , "Open" , "Straight-talking" , "Direct, outspoken" , "Frank and uninhibited" .)